Downgrading macOS to a previous version can be done, but it is important to note that it is not a simple process and requires careful attention to ensure that you don't lose any data or damage your system.
Here are the steps to safely downgrade macOS:
Backup your data: Before downgrading, it is important to back up all your important data. You can use Time Machine or any other backup tool to create a backup of your entire system.
Create a bootable installer: You will need to create a bootable installer of the previous version of macOS you want to downgrade to. You can create a bootable installer using a USB drive or an external hard drive. You can find instructions on how to create a bootable installer on the Apple Support website.
Restart your Mac: Insert the bootable installer drive and restart your Mac while holding down the Option key. This will bring up the Startup Manager, where you can select the bootable installer drive.
Erase the disk: Once you have booted from the installer drive, you will need to erase the disk before installing the previous version of macOS. Open Disk Utility, select your Mac's startup disk, and click the Erase button. This will erase all data on your disk.
Install the previous version of macOS: Once the disk is erased, you can proceed with installing the previous version of macOS. Follow the prompts on the screen to complete the installation process.
Restore your data: After the installation is complete, you can restore your data from the backup you created earlier using Time Machine or any other backup tool.
Note: Downgrading macOS can be a complex process, and it is important to make sure you have a good backup of your data before proceeding. Additionally, some applications and features may not be compatible with the previous version of macOS, so you may encounter issues with certain apps or functionality. It's always a good idea to research the version you want to downgrade to and ensure that it will meet your needs.
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