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1. Mac Os Sierra Failed To Download
2. Macos Sierra Failed To Download Recovery
3. Mac Os Sierra Failed To Install

This page covers 5 fixes for Mac won't boot or start issue after macOS Big Sur, Catalina, Sierra or older macOS update issue. If you are with this issue, follow to make your Mac computer work now:

Mac Os Sierra Failed To Download

Use Disk Utility to check for and potentially repartition the internal volume. GUID GPT partitioning, HFS+ selected. If the hard disk is working. If not, you can either swap the hard disk ( an SSD will be a substantial performance boost ), or install macOS on an external storage device as a test. MacOS Sierra 10.13/10.13.4 downloaded but won't install. If you get stuck or fail to install the downloaded macOS 10.13/10.13.4, try the tips below to get this problem fixed: Open Launchpad Delete 'Install macOS Sierra' file with a question mark on it. Reboot Mac and retry downloading a new macOS Sierra update 10.13/10.13.4.

macOS has now been updated to 11.0, and many Mac users are trying to upgrade to the newest version. While for most it's a usual pleasurable experience, for some this update had downsides. Some users complain that their Mac computers won't boot after installing new macOS Big Sur/Catalina. When Mac fails, it usually can't boot or start up properly. If you are faced with this situation, the most important thing should be recovering data from the unbootable Mac because:

• Your attempts to fix the Mac not booting issue may write new data on this Mac, which will overwrite the old data and make it irrecoverable.
• Recovering data before the complex fixes can avoid data loss.

EaseUS Mac data recovery software is able to recover data from unbootable Macs after update. It creates a bootable media that enables you to recover data from Mac hard drive (If you only have one Mac). What's more, it recovers data from failed internal Mac hard drive, APFS boot drive, and unmountable APFS boot volume, etc. If you have two Mac devices, take out the hard drive and connect it to the other Mac. Download EaseUS Data Recovery Wizard for Mac on that Mac device, and recover data from the hard drive.

Then, you can read on and Fix the 'Mac won't boot after update' issue after you have successfully got data from the drive.

1. Reset the PRAM / NVRAM

NVRAM refers to special memory sections on your Mac that store data that persists even when the Mac is shut off, such as volume settings and screen resolution. Resetting that data isn't harmful! In some cases, after performing this step, your Mac will restart normally.

• Restart your Mac
• Hold down all of these keys: 'Command', 'Option', 'P' and 'R', and turn on the Mac. (It's the same keys to reset the PRAM).
• Keep holding the keys down until you hear the Mac restart again.

You may see a progress bar on startup. If the progress bar fills up and then the Mac starts up, you're probably good to go. If not, reset SMC.

2. Reset the SMC

Smartpropoplus mac os. In some situations, you may need to reset your Mac's SMC (System Management Controller).

• Shut the Mac down.
• Unplug all cables.
• Wait for a few minutes.
• Plug the cables back in and start up the Mac.

If you've got a Mac desktop, unplug it for 15 seconds and then plug it in and after five seconds press the power button.

3. Boot Mac in Safe Mode

Safe Mode is a stripped-down version of the Mac operating system that can be useful if you are trying to troubleshoot issues with your Mac.

• Start your Mac, press and hold the 'Shift' key, and make sure your Mac has at least 9 GB of free space.
• When the login window appears to release the shift key and log in. You may be required to log in twice if you have FileVault turned on. Then restart the device.

Wait patiently till Mac computer finish the reboot process.

4. Run Disk Utility in Recovery Mode

If your Mac is booting but the operating system isn't loading up, you may have a corrupted drive. Luckily it is possible to fix this in Recovery Mode. In Recovery Mode you can restore from a Time Machine backup, use Disk Utility to verify and repair connected drives, check your internet connection, get help online using Safari, and install or reinstall macOS.

• Make sure the Mac is off. If it's stuck on a grey, blue or white screen, just hold down Mac's power button for several seconds until it shuts off.
• Hold down the 'Command' and 'R' keys, and power the Mac back up again. Keep pressing 'Cmd' + 'R' while your Mac is booting up.
• Once your Mac starts in Recovery Mode you can have access to 'Utilities'. Click 'Disk Utility', locate the icon for your Mac's drive, and click 'Verify Disk'.

5. Reinstall macOS Big Sur/Catalina/Sierra

The last method to fix macOS Big Sur, Catalina or Sierra fails to boot after update error is to reinstall macOS.

• You can download wanted macOS Big Sur/Catalina/Sierra and create a bootable USB drive to clean install macOS Big Sur/Catalina/Sierra on your computer again.
• You can also boot into Recovery mode (Solution 4), and then click to install the latest OS and follow the onscreen prompts. Our article on resetting a Mac to factory settings has more information on reinstalling macOS.

If your Mac does not respond after trying these tips, contact Apple Support or a certified Apple Repair Center. It’s likely there is a problem with your logic board or other internal hardware.

As you try to update to macOS Big Sur, you'll find there are a mess of macOS update stuck problems that stop you from moving on.

Each time a new Mac desktop operating system updates, a flood of Mac users would rush to download and install the macOS. There is no exception for macOS Big Sur, which has just been released as a free upgrade for users. It features with many significant changes or redesigns in Big Sur compared to Catalina, including the new design, Messages new features, faster Safari, enhanced apps, etc.

Many users reported that macOS download stuck, installation failed, an error occurred while installing this update, installation stuck on grey/space screen or failed issue when they attempt to get it upgraded. Concerning such miscellaneous macOS Big Sur update stuck issues, this article covers a collection of macOS Big Sur update failed problems and solutions.

Read more: macOS Big Sur update guide and quick fixes to any Big Sur update problem.

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What Should do Before Upgrading to macOS Big Sur?

Although the every new macOS upgrade comes with certain exciting features, you need to know if your Mac computer can safely be updated (take Big Sur as an example). If you pay no attention to the details, macOS Big Sur update problems come with you for sure, probably your Mac update stuck or Mac failed update won't boot. Here are some of the things that you should look for before you upgrade to the new update.

1.Check compatibility. Big Sur requires any of the following Mac models: iMac; MacBook Pro; MacBook Air; MacBook; Mac Pro; Mac Mini.
2.Check minimum software and hardware requirements. You should have OS X Mountain Lion 10.8 or later. It requires at least 35.5GB of storage space to perform the Big Sur upgrade from macOS Sierra or later, 44.5GB from an earlier release.
3.Backup your Mac. To avoid any possible macOS Big Sur update problems, making a backup of your Mac comes essential. You can backup Mac with Time Backup Machine, iCloud, iTunes, or any other third-party Mac backup tools like MacX MediaTrans.

Common macOS Big Sur Update Stuck Problems & How to Fix Them

1. Big Sur Update Download Stuck

As you attempt to download macOS Big Sur installer, you may be noticed that 'Installation requires downloading important content. That content can't be downloaded at this time. Try again later.', or 'An error has occurred.' Big Sur download times are slow this year and are always failing. It's exceedingly annoying, but there is no way to bypass this step for macOS update.

Usually Mac update download failed error is originated that you download the package from somewhere other than Mac App Store or you just downloaded the Beta version. So you need to go to Mac App Store and download the official macOS Big Sur instead to fix it. Overloaded Apple's server is also a main cause.

2. macOS Big Sur Installation Failed, An Error Occurred

Installation failed, an error occurred while installing this update while upgrading to Big Sur. It got to about 10% or halfway and failed, some users cannot even reconnect. Many users are getting the same error. The macOS Big Sur installation failed error is properly caused by overloaded Apple's server, there are tons of users rushing to download now. You can check on the status on Apple's support system status page. Wait for a while and try again.

Apple resolved the issue, however, some users still get macOS Big Sur installation stuck message. Read more: What to Do If macOS Big Sur Installation Stuck/Frozen/Slow

3. Failed to Update macOS Owing to Insufficient Storage

You know, Big Sur update requires at least 2GB RAM and 14.3GB available storage. So if your Mac computer almost ran out of the storage space, your macOS update stuck at the beginning for sure. To make sure how much space your Mac has left, from the Apple menu, select About This Mac >More Info >Storage.

If your Mac update failed definitely owing to the storage space, the only thing you need to do is to free up the space on Mac. Just make it done by uninstalling unused applications and app caches, deleting old devices backups, deleting unnecessary media files from iTunes, emptying trash can, clearing temporary files, compressing large files to smaller size and so on.

4. macOS Big Sur Update Freezes on Firmware Confirmation

The inability to verify firmware error is the mainly reported macOS update problems. Many users said as they try to update to Big Sur, the installer noticed that there is an error checking the firmware. Actually, it turns out to be a corrupted EFI partition. It's an MS-DOS formatted little slice that's needed when updating the computer firmware.

Macos Sierra Failed To Download Recovery

You can boot into rescue mode, checked the partitions with 'diskutil list' and 'verifydisk' (terminal), and fixed the EFI partition 'diskutil repairdisk (your EFI disk/partition) '.

5. Big Sur Update Installation Stuck with DiskManagement Error

After downloading the new macOS for my MacBook pro (mid-2012) with HDD, the computer restarted but continues to fail during the installation. The error I keep getting is . I completed a disk repair but no errors popped up there, so I assume nothing is wrong with the drive. I tried to reinstall macOS from recovery mode, but I continue getting this same error. Does anybody know how to fix this problem? - Apple Support

As the DiskManagement Error happens, you can try to fix it within the following steps: 1. Start in recovery with ALT+CMD+R > 2. Go to disk utility > 3.　Convert the volume to APFS > 4.　Restart the installation

6. Big Sur Update Stuck on Gray Screen

It's not always a gray screen, as strange as that may sound. The 'gray screen' problem can also manifest itself as a black screen, space screen with Apple logo, a spinning gear, a spinning globe, or a prohibitory sign. Mac update stuck on gray screen problem can occue right after you start or restart your Mac. It may be caused by a bad peripheral or peripheral cable, RAM issue, Drive issue or whatever.

Mac Os Sierra Failed To Install

Before you start to fix the macOS update stuck on gray screen problem, you need make sure what's the cause. Then you can disconnect all external peripherals, remove all but the minimum amount of RAM from your Mac, use Single-User mode to repair a Startup Drive. I think the problem will be fixed.

After you have fixed the macOS Big Sur update stuck problem, you can enjoy the salient new features of Big Sur. But at the same time, some new troubles might trouble you as well, such as like macOS Big Sur running slow, some apps get damaged or non-Apple Apps cannot be opened, Safari crashed, Mac gets overheated, or the Big Sur keeps logging you out etc. So think twice before you upgrade to macOS Big Sur, and if you encounter any Big Sur update problems, pick the macOS update problems and fixes as a reference.

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