How to Fix "macos big sur installation failed" Error and Complete Installation Successfully
Introduction
Upgrading to macOS Big Sur is a significant step for Mac users, bringing new features and improvements. However, the installation process can sometimes encounter difficulties, resulting in the dreaded "macOS Big Sur installation failed" error message. This article will provide comprehensive guidance on identifying and resolving this issue, ensuring a smooth and successful installation.
Causes of macOS Big Sur Installation Failure
Hardware Compatibility
Not all Macs are compatible with macOS Big Sur. Ensure that your Mac meets the minimum system requirements, including a 64-bit processor, at least 12GB of RAM, and 35GB of available storage space. Check Apple’s support website for a list of compatible models.
Insufficient Disk Space
The macOS Big Sur installer requires ample free storage space on your startup disk. Make sure you have at least 35GB of available space before attempting the installation. Clean up unnecessary files, move large documents to external storage, or clear cache and system logs to free up space.
Corrupted Installer or Downloaded Files
If the macOS Big Sur installer is corrupted or the downloaded files are incomplete, the installation can fail. Redownload the installer from the App Store or a reputable website. Before installing, verify the checksum of the downloaded file to ensure its integrity.
Troubleshooting Steps for "macOS Big Sur Installation Failed" Error
Restart Your Mac
Sometimes, restarting your Mac can resolve minor glitches that may have hindered the installation process. Shut down your Mac, wait a few minutes, and then turn it back on.
Reset NVRAM and SMC
Resetting the NVRAM (non-volatile random-access memory) and SMC (system management controller) can fix hardware-related issues that may be preventing macOS Big Sur installation. Follow the manufacturer’s instructions for your Mac model to perform these resets.
Disable Third-Party Antivirus and Firewall Software
Third-party antivirus and firewall software can interfere with the macOS Big Sur installation process. Temporarily disable these programs before attempting to install macOS Big Sur. Remember to re-enable them after the installation is complete.
Advanced Troubleshooting Techniques
Safe Mode Installation
Booting your Mac into Safe Mode can disable non-essential software and services that may be causing the installation error. Restart your Mac while holding down the Shift key. Once in Safe Mode, attempt to install macOS Big Sur.
Command-Line Script Installation
If all else fails, you can try installing macOS Big Sur using a command-line script. This method requires technical proficiency and should only be attempted if you are comfortable working with the Terminal. Refer to Apple’s support documentation for detailed instructions.
Boot from an External Drive
If your Mac’s startup disk is experiencing issues, you can create a bootable macOS Big Sur installer on an external drive. Format the external drive as macOS Extended (Journaled) and use Disk Utility to create a bootable installer. Start your Mac from the external drive and attempt the installation again.
Troubleshooting Table
| Troubleshooting Method | Description |
|---|---|
| Restart Your Mac | Restarting your Mac can resolve minor glitches that may have hindered the installation process. |
| Reset NVRAM and SMC | Resetting the NVRAM (non-volatile random-access memory) and SMC (system management controller) can fix hardware-related issues that may be preventing macOS Big Sur installation. |
| Disable Third-Party Antivirus and Firewall Software | Third-party antivirus and firewall software can interfere with the macOS Big Sur installation process. Temporarily disable these programs before attempting to install macOS Big Sur. |
| Safe Mode Installation | Booting your Mac into Safe Mode can disable non-essential software and services that may be causing the installation error. |
| Command-Line Script Installation | Installing macOS Big Sur using a command-line script requires technical proficiency and should only be attempted if you are comfortable working with the Terminal. |
| Boot from an External Drive | Creating a bootable macOS Big Sur installer on an external drive can help bypass issues with your Mac’s startup disk. |
Conclusion
Experiencing the "macOS Big Sur installation failed" error can be frustrating, but it can be resolved with the right troubleshooting techniques. By following the steps outlined in this article, you can identify the root cause of the issue and complete the installation successfully. Remember to carefully review the causes, troubleshooting steps, and advanced troubleshooting techniques to ensure a smooth and successful upgrade to macOS Big Sur.
FAQ about macOS Big Sur Installation Failed
1. Why can’t I install macOS Big Sur?
- A: Check the compatibility of your Mac with macOS Big Sur and make sure your device is supported. Ensure you have enough free storage space and a stable internet connection.
2. My Mac meets the requirements, but the installation still fails.
- A: Restart your Mac in Safe Mode, which disables certain software and drivers that may interfere with the installation. Then, try installing macOS Big Sur again.
3. I get an error message saying "This copy of the Install macOS Big Sur application is damaged."
- A: Download the macOS Big Sur installer again from the App Store and try installing it again.
4. The installation process gets stuck or freezes.
- A: Wait patiently for the installation to complete. If it’s still frozen after an extended period, force restart your Mac by pressing and holding the power button until it shuts down.
5. I see a message that says "The selected disk is not a valid destination."
- A: Make sure the target disk has enough free space and is properly formatted. Use Disk Utility to erase the disk and format it as APFS or Mac OS Extended (Journaled).
6. I get an error message about an "Invalid signature."
- A: Try resetting the NVRAM/PRAM by starting your Mac while holding down Command + Option + P + R. Release the keys when you hear the startup chime a second time.
7. The installation completes, but my Mac won’t boot into macOS Big Sur.
- A: Try restarting your Mac in Recovery Mode by holding down Command + R while it boots. Then, select "Reinstall macOS" from the Utilities menu.
8. I can’t find the macOS Big Sur installer in the App Store.
- A: Make sure your Mac is compatible with macOS Big Sur and your Apple ID is associated with the correct region. Try searching for "macOS Big Sur" in the App Store.
9. Can I install macOS Big Sur on an external drive?
- A: Yes, but macOS Big Sur will not be able to boot from an external drive.
10. Where can I get additional support?
- A: Contact Apple Support online or through the Genius Bar at an Apple Store. You can also check Apple’s support website for further assistance.
