5 Simple Methods to Fix macOS Sierra with Error and Restore the Lost Data

Last Updated on April 13, 2023 by Yulia Ilina

If you are using MacBook 2017 or previous versions, you can install or update macOS Sierra. When you have some problems with macOS Sierra installation, such as macOS Sierra Cannot be Installed on Null, Install macOS Sierra Application is Damaged, or others. If you just need to use a previous MacBook again, here are 5 easy methods to help you out or even retrieve the lost files.

Fix macOS Sierra with Error

Part 1: How to Fix System Verify or Repair Failed for macOS Sierra

What should you do to fix File system verify or repair failed. : (-69845) or Storage system verify or repair failed. : (-69716)? Disk Utility is the built-in feature to fix the macOS Sierra problem. If the internal drive of your Mac is severely corrupted, you have to enable the First Aid option through macOS Recovery Mode, which can fix, verify, and repair failed macOS Sierra with the following process.

Step 1: Go to the Apple menu and choose the Restart button to restart your MacBook. Press and hold the Command + R keys to get into the Recovery Mode. Once the Apple logo appears, release the keys.

Step 2: Select the Disk Utility option from the macOS Utility menu. Choose the corrupted drive located in the left sidebar section. After that, you can click the Erase button to fix the damaged macOS Sierra.

Step 3: Click the First Aid option on the upper menu is another choice. Wait for the verification and repair of the drive. After that, you can click the Done button to exit First Aid.

macOS Recovery Mode Disk Utility Win Download Mac Download

Part 2: How to Fix macOS Sierra Cannot be Installed on Null

If your Mac is stuck on checking Null when installing macOS Sierra, it is the reason for an invalid hard drive or installs macOS Sierra app. Just rename the Macintosh hard drive for installation and reinstall macOS to fix macOS Sierra cannot be installed on Null accordingly. Of course, you can also upgrade to the latest macOS as a hotfix.

Step 1: Restart your MacBook and press the Command + R keys to boot into macOS Recovery Mode. After that, you can choose the Disk Utility option and click the Continue button.

Step 2: Select the desired hard drive located on the left side and then click the Erase button. After that, you can change the name of the Macintosh HD and retain the format as APFS.

Step 3: Click the Erase button again and confirm. Go back to the Disk Utility window and choose the Reinstall macOS Sierra option. Follow the provided instructions to install the macOS.

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Part 3: How to Fix the Install macOS Sierra Application is Damaged

Is there a way to fix the error when installing macOS Sierra, This copy of the install macOS sierra is damaged? The error will prevent the macOS installer from working. Just re-download the installer again from Apple, which contains a new fresh certificate that is not expired. If it still does not work, you can also follow the method below to have another check.

Step 1: Press the Command + Space keys to access the Spotlight search. After that, type disk utility in the column and select the Disk Utility app from the drop-down list.

Step 2: Choose the Volume button located in the sidebar menu on the Disk Utility Window. Click the First Aid button and choose the Run option for the pop-up dialogue to fix the damaged volume.

Step 3: There is another pop-up appears asking for the final mode to run the diagnosis that will repair the drive. Just click the Continue button to fix the damaged disk volume for macOS Sierra installation.

First Aid Mac Win Download Mac Download

Part 4: How to Fix Volume Does Not Meet Requirements for This Update

Even if you have enough storage space for macOS Sierra, you cannot install the macOS Sierra with an error message, macOS Sierra 10.12 update can't be installed on this disk. Besides checking the configuration, you can also wait for the FileVault encryption to finish to install macOS updates or check the process below.

Step 1: Make sure you are using MacBook 2009/MacBook 2010 or newer versions. To install macOS Sierra, you should use OSX 10.7.5 or later with 2GB of memory and 8.8GB of available storage.

Step 2: Go to the Apple menu and choose the System Preferences option. After that, click the Security & Privacy icon within the System Preferences window and choose the FileVault tab.

Step 3: When you find the FileVault is still under processing, you have to wait till the end of the process. Once the whole process is done, the macOS Sierra update should install just fine.

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Part 5: How to Fix macOS Sierra Is Downloaded but Cannot Be Installed

When the macOS Sierra installation stuck, you can simply reset the PRAM and NVRAM to fix the macOS Sierra installation problem. Since NVRAM is a non-volatile form of memory associated with flash memory, you can solve macOS Sierra cannot be installed as follows.

Step 1: Restart your MacBook or even long-press the Power button to turn it off. Hold the Option + Command + P + R keys at the same time when the system starts.

Step 2: Keep holding the key combination until a second Apple logo appears or hear the startup chime. It will reset the NVRAM on your Mac automatically and install the macOS Sierra without error.

Reset Mac Pram Win Download Mac Download

Part 6: How to Recover Data from macOS Sierra with Errors

Whether you need to erase the hard drive, fix the damaged volume, or simply want to retrieve the lost files, Mac Data Recovery is a simple way to recover data from macOS Sierra errors with a high success rate. It provides 2 different modes to scan the deleted or lost files on different devices. Whether you need to get back the photos, videos, Emails, or even the ZIP files, you can easily find the desired categories in the left menu. Moreover, there are filters to search for the files via name and path.

1. Retrieve the lost and deleted files for any macOS Sierra installation errors.

2. Provide an advanced deep scan to retrieve any files you have on the Mac.

3. Scan the desired file format only via a certain category or find all formats.

4. Preview the retrieved deleted files before purchasing a license or recovery.

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Step 1: Once you have installed Mac Data Recovery, launch the program on your MacBook. If you are using the program for the first time, you can disable the System Integrity Protection option beforehand. After that, choose the Mac Data Recovery menu to continue.

Mac Data Recovery

Step 2: Choose the desired file formats, including image, audio, video, Email, and more. Of course, you can simply enable the Check all file types option. Select the desired hard disk drive before clicking the Scan button to perform the quick scan mode.

Scan Mac

Step 3: When the whole process is done, you can choose the desired format category from the left menu to locate the deleted files. Just click the Recover button to recover data from the macOS installation errors or choose the Deep Scan mode to find more.

Deep Scan Mac Win Download Mac Download


When you have problems with macOS Sierra installation, here are the 5 ways to help you out in no time. You can always make use of methods, such as resetting the PRAM and NVRAM, repairing the macOS drive, renaming the hard disk, and more. If there are any lost or deleted files during the process, Mac Data Recovery should be the optimal choice.