Boot Failure After Macos High Sierra 10.13.2 Upgrade

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Boot Failure After Macos High Sierra 10.13.2 Upgrade

Macos High Sierra 10.13.6
Boot Failure After Macos High Sierra 10.13.2 Upgrade Windows 10
Macos Sierra
Boot Failure After Macos High Sierra 10.13.2 Upgrade Guide
After updating to High Sierra Version 10.13.6 (17G5019), I can not open Disk Utility. I receive the following: “Disk Utility cannot be opened because of a problem. Check with the developer to make sure Disk Utility works with this version of macOS”. Reinstalling High Sierra, twice, has not solved this issue. Since the update installer would load automatically on every boot this results in a boot loop. However I figured out that I can force to boot into macOS with ALT+R which has been a temporary fix for me since then. Mac won't restart after macOS Mojave update. MacOS 10.14 Mojave is coming after 10.13 High Sierra. Thus, the same boot problems on macOS High Sierra could also happen to macOS Mojave. As you might know, Apple introduced the System Integrity Protection (SIP) feature since OS X EI Capitan. It was originally introduced to keep system security. Apr 26, 2018 We’re going to focus on two main approaches; running the update again (if it’s a general failure upon attempting to install from the App Store) or by trying to install macOS 10.13.4 with the macOS High Sierra 10.13.4 Combo Update package instead of through the Mac App Store, or simply choosing to reinstall macOS system software. Apr 22, 2018 I did all the steps and all was fine, but in this point “And after some time you should have the new MacOS 10.13.4 High Sierra ready in you VirtualBox.” never boot. Show me options to select disk/ or access UEFI menu. No info in the partitions.
Summary: This post is about how to fix when Mac won't boot after macOS update. If macOS Big Sur or macOS Catalina update makes your Mac not booting up, you'll know why and how to fix it quickly and easily.

Apple releases macOS and software updates periodically for better user experience. However, it backfires when your Mac won't boot after macOS update. Especially for some Mac newbies, Mac not turning on would drive them crazy.
Hence, this post will walk you through this problem. Then, you'll know what to do when Mac gets stuck on the Apple logo.
All right. Let's begin with why your Mac is not booting up after the macOS update.
Why is the Mac not turning on after macOS update?Why won't Mac update successfully? It's fair enough to say, most of the time, Mac won't turn on after macOS update because of software incompatibility and bugs. 
As we all know, technology inspires new programs and hardware to be released constantly. So, your Mac needs to update to work with most software and hardware. Sometimes, it's an overall macOS update. And sometimes, it's a tiny patch like this.
In detail, a macOS update could involve those activities.
Upgrade certain necessary drivers. Sometimes, it simply installs patches to fix bugs. But sometimes, it will replace the whole driver structure to better use hard drives, keyboard, mouse, microphone, camera, etc.
Upgrade the Kernel programs. Such updates will improve the security, accessibility, and management of core data.
Redesign or update certain built-in applications. Utilities like Disk Utility, Safari, and Mail come along with the operating system. So, it could be updated for a better user experience.
Other updates like operating system structure, file system, user interface, etc.
These updates are usually for a better user experience. Or they are for better supporting most of the latest hardware and software. However, as it is pointed out, the updated macOS can only work 'most' of them. 
For example, Nvidia GTX 750 Ti can't work with Mac OS X earlier than Yosemite. After such a software update, Mac is not worknig, or the Mac or MacBook gets stuck on a loading bar after update. Once the third-party software and hardware on your Mac won't work with the latest macOS, your Mac won't turn on.
Common boot problems after macOS updatemacOS is an improved range of Mac operating systems after Mac OS X. Up to now, there are three macOS systems available: macOS High Sierra, macOS Mojave, and macOS Catalina. Nevertheless, updating to each of them could cause problems.
1. Mac won't turn on after macOS Big Sur updateThe newest major release of Mac operating system is macOS 11 Big Sur, which now is in beta version. Up to now, known boot issues of macOS Big Sur Beta include the following, or more.
If you updated to macOS Big Sur 11.0 but not the newest vesion that has fixed existing bugs.
You choose a wrong startup disk after installing macOS Big Sur 11.
A Complete List of macOS Catalina Problems and Solutions
It talks about macOS 11 Big Sur update problems including downloading, installing, apps not working, not booting, battery issues and so on. Read more >>
2. Mac won't boot after macOS Catalina updateThen it comes to macOS Catalina. Even though it should be better than the previous two, (In some aspects, it is.) Catalina update problems like Mac won't boot after macOS update still occur.
Except for APFS conversion, the macOS Catalina update will automatically divide your hard drive into two volumes. One is the read-only Macintosh HD system volume, and the other is Macintosh HD - Data for saving your files. But if there is not enough free space for an update, your Mac will get stuck on a update loop.Whta's worse, you might see the Mac folder with question mark at startup because macOS Catalina update is not found.
What's more, the 'Full Disk Access' permission might be a lion in the way for some unauthorized applications. For instance, you have a program that requires certain Kernel extensions. But after updating to macOS Catalina, this program can't access the Kernel resource anymore. It doesn't have permission. As a result, your Mac will be frozen at the loading bar because this program keeps asking for resource permission.
A Complete List of macOS Catalina Problems and Solutions
It talks about macOS Catalina problems including downloading, installing, apps not working, not booting, battery issues and so on. Read more >>
3. Mac won't restart after macOS Mojave updatemacOS 10.14 Mojave is coming after 10.13 High Sierra. Thus, the same boot problems on macOS High Sierra could also happen to macOS Mojave. As you might know, Apple introduced the System Integrity Protection (SIP) feature since OS X EI Capitan. Mydefrag portable download. It was originally introduced to keep system security. But once this feature was disabled previously before you update to macOS Mojave, it could cause boot problems.
For example, the Google software update on September 23, 2019, was shipped with a bug. This flaw damages the macOS file system on computers where System Integrity Protection is disabled. Many video professionals reported that their Mac crashed due to this.
So, just think about it, even Google can't avoid such software conflict, how about other third-party software? That's one of the reasons why many users who disabled SIP previously get Mac crashed after installing macOS Mojave.
4. Mac won't boot after macOS High Sierra updateOne of the major updates in macOS High Sierra is the introduction of the Apple File System (APFS). As a part of the upgrade process, the macOS High Sierra installer will automatically convert the SSD to the APFS file system.

Boot Failure After Macos High Sierra 10.13.2 Upgrade

Even though Apple claims that the conversion process is supposed to be risk-free, many Mac users still meet problems. And disk corruption during the update is one of them. In this case, it's sure that the Mac won't restart after update. Mac will stop loading after update for such corruption.
Except for hard drive corruption, hardware or software incompatibility is another major reason. As your computer needs to work with so much hardware and software, the in-between conflict is inevitable. Those incompatibilities could slow your Mac down. They could make your Mac not responsive. Or, the Mac won't let you log in with right password. Also, the Mac could freeze on a black or Mac white screen of death.
What to do if Mac can't turn on after macOS update?Having discussed why Mac won't boot after macOS update, you may find that it's tricky to hit the point. But don't worry, here are some inspirations so that you can troubleshoot this issue step by step:
1. Check if the Mac hard drive is corrupted
2. Check if any program is not compatible with your macOS
3. Check for a hardware incompatibility
 Step 1: Check and repair the Mac hard drive in macOS Recovery mode
If your Mac refuses to boot after the update, you should check the Mac hard drive. Chances are that your MacBook ran out of power and the APFS reformatting process was interrupted. Or the hard drive is corrupted for bad sectors. 

In this case, you can try to repair the hard drive with Disk Utility under Recovery Mode. Disk Utility helps Mac boot up in some ways sicne it's the built-in free disk repair tool on your Mac.
Learn how to run First Aid on the startup disk and repair the file system or disk errors.
If no disk error was found by Disk Utility, then the hard drive should not be responsible for this issue. To find out why you can't turn on your Mac after macOS update, you can try Safe Mode.
Step 2: Boot your Mac into Safe Mode
You may be wondering 'why should I do this in Safe Mode?' The reason is that Safe Mode will only launch some basic necessary programs at startup. It’s easier to isolate incompatibility software that makes your Mac unbootable.
Make sense, right? Then let's dive into details on how to do this. 
1. Press and hold the power button until the Mac forcibly shuts down.
2. To start the Mac up in Safe Mode, restart this Mac with Shift key pressed and held.
3. Release the key when you see the progress bar.
If you boot into Safe Mode successfully, you'll see Safe Boot at the right top. At least, it indicates that the macOS update is not failed. Then, it should be third-party software incompatibility. 
But to figure out exactly which program makes your Mac unbootable, you need to reboot into Verbose Mode. Verbose mode allows you to see what's happening when macOS is starting up. 
You can hold Command + V at startup. Then you'll see a live report when your Mac is booting up. Once you find out the culprit, you can simply uninstall the software in Safe Mode
But if you fail to boot into Safe Mode, it means it's a macOS update failure. The system data is damaged or broken. You need to reinsall the macOS in macOS Recovery mode. You can simply boot into macOS Recovery Mode and choose Reinstall macOS. If you don't want to update macOS anymore, you can try your luck with using APFS snapshot to recover your system.
The point is that macOS reinstallation will risk your data on the Mac. Thus, you should first check your backups. Or you can recover data from unbootable Mac first.
Learn how to get your important files off the startup disk when your Mac won't boot.
Tips: You can prevent APFS conversion with start to install this time if you want to avoid unnecessary problems. But you are not advised to unless you are a Mac command geek.
Step 3: Ask Apple repair store for help
The toughest thing is that your hard drive is fine. And there is no software incompatibility noticed in Verbose Mode. In this case, you should check the hardware inside your Mac.
The reason is that macOS updates are always for better supporting the latest software and hardware. So, the hardware or drivers on your Mac may be too outdated to work with the newer OS.
In this case, you can ask help from the Apple repair store and reset the Mac. If it's the Mac machine itself is too old, you should replace it with a newer Mac model. Or you simply don't allow automatically update the macOS.
How to avoid macOS update failure?Every time there is a new macOS update available, you'll receive a notification. It asks 'Do you want to restart to install these updates now or try tonight?'. However, it's not safe to update directly because your Mac could get stuck on update or even lose important files. In case the Mac won’t boot after macOS Big Sur or Catalina update, you surely can do some preparations in advance.
 Read several reviews from tech enthusiasts to learn problems when a new macOS beta is released.
 Make sure your Mac model and its hardware work with the updated macOS.
 Read macOS update instructions carefully when you are up to update your system.
 Back up your files, photos, documents, etc.
 Make sure there is enough free disk space for macOS update.
 Make sure your Mac is connected to power to avoid the black screen of death during macOS update.
So, you'd better do these preparations before you update to any operating system. But if your Mac can't boot up already, you should calm down and follow this guide to fix this issue. If you have any more any feasible solution to enrich this article, kindly drop us a hint at [email protected]
“ - When I tried to update to the new High Sierra, the Mac downloaded and rebooted as expected. But then it hung on the ‘Installing software update’ screen all day long.
 - Mac OS High Sierra install failed, and no error details. ”
macOS 10.13.6 High Sierra version is the latest update for all macOS High Sierra users. You can install macOS High Sierra update for about 45 minutes to 2 hours. If the macOS 10.13 High Sierra update cannot be installed for hours, you need to take measures to solve the problem.
Well, these are workable ways to fix macOS 10.13 high Sierra update failure successfully.
Guide List 1. Fix macOS 10.13 High Sierra Won’t Install after DownloadingIf you fail to install the downloaded macOS 10.13 High Sierra update, you can use the following tips to fix the macOS update error.
Macos High Sierra 10.13.6 Open Launchpad. Find and delete the Install macOS Sierra file with a question mark attached.
 Reboot your Mac. Then you can re-download and reinstall macOS 10.13 High Sierra update.
Choose the Apple icon on the top left corner of the screen. Select the App Store from the list. Later, you can locate the Update section to fix macOS 10.13 High Sierra won’t install failure.
You can also learn how to fix macOS Sierra won't boot after updating. 
2. Solve macOS 10.13 High Sierra Update Failure via Safe ModeBoot Failure After Macos High Sierra 10.13.2 Upgrade Windows 10You can disable or uninstall anti-virus software first. Check if your computer is under a strong and fast Internet connection. If these measures are useless, you can boot Mac in Safe Mode to fix macOS 10.13 High Sierra failed to update.
 Power off your computer.
 Restart Mac and hold the Shift key.
 Do not release the Shift key until the Apple logo appears.
 Install macOS 10.13 update in Safe Mode to fix Mac OS update failure.
Note: You can use System Information to check if your Mac is started in Safe Mode.
You can use the same way to fix MacBook Pro shuts down randomly or fix macOS Sierra 10.12.1 Update Stuck Error.
3. Troubleshoot macOS 10.13 High Sierra Update Failure with a Clean InstallationWhat if your macOS 10.13 High Sierra stuck or freeze while installing? It is also a frequently asked question that the Mac OS installation couldn’t be completed. During this time, you can complete a clean macOS 10.13 High Sierra update with a bootable USB drive.
 Connect the UDB drive to Mac 
 Download macOS Sierra 10.13.6 installation package from Mac App Store. Plug a portable USB drive to Mac. Run Finder and choose Applications in the left panel. Find Disk Utility in the Utilities folder. Select the thumb drive in the sidebar. Then choose the Format option.
 Create a bootable macOS 10.13 High Sierra installer
 You need to name the plugged USB drive as Untitled. Choose OS X Extended followed by Erase. After formatting the USB drive and downloading macOS 10.13 High Sierra, you can open the Terminal window. Type and following command in Terminal and then hit Enter.
sudo /Applications/Install macOS Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/SierraBootInstall --applicationpath /Applications/Install macOS Sierra.app --nointeraction &&say Done

Apple releases macOS and software updates periodically for better user experience. However, it backfires when your Mac won't boot after macOS update. Especially for some Mac newbies, Mac not turning on would drive them crazy.
Hence, this post will walk you through this problem. Then, you'll know what to do when Mac gets stuck on the Apple logo.
All right. Let's begin with why your Mac is not booting up after the macOS update.
Why is the Mac not turning on after macOS update?Why won't Mac update successfully? It's fair enough to say, most of the time, Mac won't turn on after macOS update because of software incompatibility and bugs. 
As we all know, technology inspires new programs and hardware to be released constantly. So, your Mac needs to update to work with most software and hardware. Sometimes, it's an overall macOS update. And sometimes, it's a tiny patch like this.
In detail, a macOS update could involve those activities.
Upgrade certain necessary drivers. Sometimes, it simply installs patches to fix bugs. But sometimes, it will replace the whole driver structure to better use hard drives, keyboard, mouse, microphone, camera, etc.
Upgrade the Kernel programs. Such updates will improve the security, accessibility, and management of core data.
Redesign or update certain built-in applications. Utilities like Disk Utility, Safari, and Mail come along with the operating system. So, it could be updated for a better user experience.
Other updates like operating system structure, file system, user interface, etc.
These updates are usually for a better user experience. Or they are for better supporting most of the latest hardware and software. However, as it is pointed out, the updated macOS can only work 'most' of them. 
For example, Nvidia GTX 750 Ti can't work with Mac OS X earlier than Yosemite. After such a software update, Mac is not worknig, or the Mac or MacBook gets stuck on a loading bar after update. Once the third-party software and hardware on your Mac won't work with the latest macOS, your Mac won't turn on.
Common boot problems after macOS updatemacOS is an improved range of Mac operating systems after Mac OS X. Up to now, there are three macOS systems available: macOS High Sierra, macOS Mojave, and macOS Catalina. Nevertheless, updating to each of them could cause problems.
1. Mac won't turn on after macOS Big Sur updateThe newest major release of Mac operating system is macOS 11 Big Sur, which now is in beta version. Up to now, known boot issues of macOS Big Sur Beta include the following, or more.
If you updated to macOS Big Sur 11.0 but not the newest vesion that has fixed existing bugs.
You choose a wrong startup disk after installing macOS Big Sur 11.
A Complete List of macOS Catalina Problems and Solutions
It talks about macOS 11 Big Sur update problems including downloading, installing, apps not working, not booting, battery issues and so on. Read more >>
2. Mac won't boot after macOS Catalina updateThen it comes to macOS Catalina. Even though it should be better than the previous two, (In some aspects, it is.) Catalina update problems like Mac won't boot after macOS update still occur.
Except for APFS conversion, the macOS Catalina update will automatically divide your hard drive into two volumes. One is the read-only Macintosh HD system volume, and the other is Macintosh HD - Data for saving your files. But if there is not enough free space for an update, your Mac will get stuck on a update loop.Whta's worse, you might see the Mac folder with question mark at startup because macOS Catalina update is not found.
What's more, the 'Full Disk Access' permission might be a lion in the way for some unauthorized applications. For instance, you have a program that requires certain Kernel extensions. But after updating to macOS Catalina, this program can't access the Kernel resource anymore. It doesn't have permission. As a result, your Mac will be frozen at the loading bar because this program keeps asking for resource permission.
A Complete List of macOS Catalina Problems and Solutions
It talks about macOS Catalina problems including downloading, installing, apps not working, not booting, battery issues and so on. Read more >>
3. Mac won't restart after macOS Mojave updatemacOS 10.14 Mojave is coming after 10.13 High Sierra. Thus, the same boot problems on macOS High Sierra could also happen to macOS Mojave. As you might know, Apple introduced the System Integrity Protection (SIP) feature since OS X EI Capitan. Mydefrag portable download. It was originally introduced to keep system security. But once this feature was disabled previously before you update to macOS Mojave, it could cause boot problems.
For example, the Google software update on September 23, 2019, was shipped with a bug. This flaw damages the macOS file system on computers where System Integrity Protection is disabled. Many video professionals reported that their Mac crashed due to this.
So, just think about it, even Google can't avoid such software conflict, how about other third-party software? That's one of the reasons why many users who disabled SIP previously get Mac crashed after installing macOS Mojave.
4. Mac won't boot after macOS High Sierra updateOne of the major updates in macOS High Sierra is the introduction of the Apple File System (APFS). As a part of the upgrade process, the macOS High Sierra installer will automatically convert the SSD to the APFS file system.
Even though Apple claims that the conversion process is supposed to be risk-free, many Mac users still meet problems. And disk corruption during the update is one of them. In this case, it's sure that the Mac won't restart after update. Mac will stop loading after update for such corruption.
Except for hard drive corruption, hardware or software incompatibility is another major reason. As your computer needs to work with so much hardware and software, the in-between conflict is inevitable. Those incompatibilities could slow your Mac down. They could make your Mac not responsive. Or, the Mac won't let you log in with right password. Also, the Mac could freeze on a black or Mac white screen of death.
What to do if Mac can't turn on after macOS update?Having discussed why Mac won't boot after macOS update, you may find that it's tricky to hit the point. But don't worry, here are some inspirations so that you can troubleshoot this issue step by step:
1. Check if the Mac hard drive is corrupted
2. Check if any program is not compatible with your macOS
3. Check for a hardware incompatibility
 Step 1: Check and repair the Mac hard drive in macOS Recovery mode
If your Mac refuses to boot after the update, you should check the Mac hard drive. Chances are that your MacBook ran out of power and the APFS reformatting process was interrupted. Or the hard drive is corrupted for bad sectors. 
In this case, you can try to repair the hard drive with Disk Utility under Recovery Mode. Disk Utility helps Mac boot up in some ways sicne it's the built-in free disk repair tool on your Mac.
Learn how to run First Aid on the startup disk and repair the file system or disk errors.
If no disk error was found by Disk Utility, then the hard drive should not be responsible for this issue. To find out why you can't turn on your Mac after macOS update, you can try Safe Mode.
Step 2: Boot your Mac into Safe Mode
You may be wondering 'why should I do this in Safe Mode?' The reason is that Safe Mode will only launch some basic necessary programs at startup. It’s easier to isolate incompatibility software that makes your Mac unbootable.
Make sense, right? Then let's dive into details on how to do this. 
1. Press and hold the power button until the Mac forcibly shuts down.
2. To start the Mac up in Safe Mode, restart this Mac with Shift key pressed and held.
3. Release the key when you see the progress bar.
If you boot into Safe Mode successfully, you'll see Safe Boot at the right top. At least, it indicates that the macOS update is not failed. Then, it should be third-party software incompatibility. 
But to figure out exactly which program makes your Mac unbootable, you need to reboot into Verbose Mode. Verbose mode allows you to see what's happening when macOS is starting up. 
You can hold Command + V at startup. Then you'll see a live report when your Mac is booting up. Once you find out the culprit, you can simply uninstall the software in Safe Mode
But if you fail to boot into Safe Mode, it means it's a macOS update failure. The system data is damaged or broken. You need to reinsall the macOS in macOS Recovery mode. You can simply boot into macOS Recovery Mode and choose Reinstall macOS. If you don't want to update macOS anymore, you can try your luck with using APFS snapshot to recover your system.
The point is that macOS reinstallation will risk your data on the Mac. Thus, you should first check your backups. Or you can recover data from unbootable Mac first.
Learn how to get your important files off the startup disk when your Mac won't boot.
Tips: You can prevent APFS conversion with start to install this time if you want to avoid unnecessary problems. But you are not advised to unless you are a Mac command geek.
Step 3: Ask Apple repair store for help
The toughest thing is that your hard drive is fine. And there is no software incompatibility noticed in Verbose Mode. In this case, you should check the hardware inside your Mac.
The reason is that macOS updates are always for better supporting the latest software and hardware. So, the hardware or drivers on your Mac may be too outdated to work with the newer OS.
In this case, you can ask help from the Apple repair store and reset the Mac. If it's the Mac machine itself is too old, you should replace it with a newer Mac model. Or you simply don't allow automatically update the macOS.
How to avoid macOS update failure?Every time there is a new macOS update available, you'll receive a notification. It asks 'Do you want to restart to install these updates now or try tonight?'. However, it's not safe to update directly because your Mac could get stuck on update or even lose important files. In case the Mac won’t boot after macOS Big Sur or Catalina update, you surely can do some preparations in advance.
 Read several reviews from tech enthusiasts to learn problems when a new macOS beta is released.
 Make sure your Mac model and its hardware work with the updated macOS.
 Read macOS update instructions carefully when you are up to update your system.
 Back up your files, photos, documents, etc.
 Make sure there is enough free disk space for macOS update.
 Make sure your Mac is connected to power to avoid the black screen of death during macOS update.
So, you'd better do these preparations before you update to any operating system. But if your Mac can't boot up already, you should calm down and follow this guide to fix this issue. If you have any more any feasible solution to enrich this article, kindly drop us a hint at [email protected]
“ - When I tried to update to the new High Sierra, the Mac downloaded and rebooted as expected. But then it hung on the ‘Installing software update’ screen all day long.
 - Mac OS High Sierra install failed, and no error details. ”
macOS 10.13.6 High Sierra version is the latest update for all macOS High Sierra users. You can install macOS High Sierra update for about 45 minutes to 2 hours. If the macOS 10.13 High Sierra update cannot be installed for hours, you need to take measures to solve the problem.
Well, these are workable ways to fix macOS 10.13 high Sierra update failure successfully.
Guide List 1. Fix macOS 10.13 High Sierra Won’t Install after DownloadingIf you fail to install the downloaded macOS 10.13 High Sierra update, you can use the following tips to fix the macOS update error.
Macos High Sierra 10.13.6 Open Launchpad. Find and delete the Install macOS Sierra file with a question mark attached.
 Reboot your Mac. Then you can re-download and reinstall macOS 10.13 High Sierra update.
Choose the Apple icon on the top left corner of the screen. Select the App Store from the list. Later, you can locate the Update section to fix macOS 10.13 High Sierra won’t install failure.
You can also learn how to fix macOS Sierra won't boot after updating. 
2. Solve macOS 10.13 High Sierra Update Failure via Safe ModeBoot Failure After Macos High Sierra 10.13.2 Upgrade Windows 10You can disable or uninstall anti-virus software first. Check if your computer is under a strong and fast Internet connection. If these measures are useless, you can boot Mac in Safe Mode to fix macOS 10.13 High Sierra failed to update.
 Power off your computer.
 Restart Mac and hold the Shift key.
 Do not release the Shift key until the Apple logo appears.
 Install macOS 10.13 update in Safe Mode to fix Mac OS update failure.
Note: You can use System Information to check if your Mac is started in Safe Mode.
You can use the same way to fix MacBook Pro shuts down randomly or fix macOS Sierra 10.12.1 Update Stuck Error.
3. Troubleshoot macOS 10.13 High Sierra Update Failure with a Clean InstallationWhat if your macOS 10.13 High Sierra stuck or freeze while installing? It is also a frequently asked question that the Mac OS installation couldn’t be completed. During this time, you can complete a clean macOS 10.13 High Sierra update with a bootable USB drive.
 Connect the UDB drive to Mac 
 Download macOS Sierra 10.13.6 installation package from Mac App Store. Plug a portable USB drive to Mac. Run Finder and choose Applications in the left panel. Find Disk Utility in the Utilities folder. Select the thumb drive in the sidebar. Then choose the Format option.
 Create a bootable macOS 10.13 High Sierra installer
 You need to name the plugged USB drive as Untitled. Choose OS X Extended followed by Erase. After formatting the USB drive and downloading macOS 10.13 High Sierra, you can open the Terminal window. Type and following command in Terminal and then hit Enter.
sudo /Applications/Install macOS Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/SierraBootInstall --applicationpath /Applications/Install macOS Sierra.app --nointeraction &&say Done
Fix macOS 10.13 High Sierra update failure 
 Connect this bootable USB drive to your Mac. When you restart your computer, you need to hold and press the Option key. Do not release it until you hear the reboot tone. Then select the Install macOS Sierra disk in the drive list.
Later, choose Mac’s startup disk from the Disk Utility list. Click Erase to format it. Once the process is finished, go back to the Utilities window. Choose Install macOS and install it to the recently formatted Mac startup drive.
Now you can follow the on-screen instruction to install macOS 10.13 High Sierra update completely.
4. Recover Lost Files Due to macOS 10.13 High Sierra UpdateIt does not matter if you forgot to make a backup with Time Machine. Actually, FoneLab Data Retrievercan help you recover any deleted or lost Mac file without data overwritten.
There is no need to recover the entire Mac backup file. You can recover the selected file on Mac with the Mac data recovery software safely and easily.
FoneLab Data RetrieverFoneLab Data Retriever - recover the lost/deleted data from computer, hard drive, flash drive, memory card, digital camera and more.
Recover photos, videos, documents and more data with ease.
Preview data before recovery.
Recover data from device, iCloud and iTunes.
Recover lost data from macOS 10.13 High Sierra update failure, formatted partition, RAW hard drive and other crashed issues.
Support various recoverable data types, such as recover computer emails, photos, documents, videos, emails, music, etc. 
Find both deleted and existing files on Mac via Quick Scan and Deep Scan modes. 
Filter and preview any file with the detailed information.
Guarantee not to store or modify your Mac data. 
Have you fixed macOS 10.13 High Sierra update failure now? If not, you can write down the main symptom below. By the way, the data recovery software for Mac can work under all data loss situations. You can use this tool to recover hidden Mac files quickly too. 
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