Also, one of the next steps will include erasing your HD on macOS Big Sur and recovering your data on another system.
In case something goes wrong, you can always recover your important data. Generally, we recommend that you always back up Mac’s data before updating and installing any new system on your computer. Disconnect all external devices from your Mac, except the hard drive you may use for making a backup.Make sure that you have a stable internet connection.If you use a MacBook, connect it to a power source.First, prepare your computer for reverting to macOS Catalina. Steps to revert to macOS Catalina from Big Sur on a Mac 1. Use MacCleaner Pro to clean up all junk stuff on a hard drive and speed up your Mac. In fact, a special software MacCleaner Pro can help you to recover valuable disk space, optimize disk usage, and fix a slow Mac performance. Generally, each new system needs more available free space for which fresh hardware is required to work smoothly. You may want to go back to macOS Catalina or older versions of the system because, after the upgrade, your Mac started to run slowly.
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