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JAY356 Author

Level 1

4 points

Problems not working with current macOS

My daughter mistakenly upgraded to Big Sur from Mojave. She has a MacBook Air (early 2020), and I can't seem to reinstall Mojave!! Now alot of her programs don't work, and I've erased the HD several times, and I've tried to install a new operation system, but the installer USB is not being read and I get the NO symbol. Her Time Machines are all Big Sur, and now THEY won't even install!!! I am forced to install Catalina--WHICH ALSO HAS PROBLEMS WITH HER PROGRAMS...

Big Sur is BIG PROBLEMS!!! Can anyone help me roll back her machine please?????

[Re-Titled by Moderator]

Posted on Jun 3, 2021 2:20 PM

Top-ranking reply

tbirdvet

Level 6

14,206 points

Posted on Jun 3, 2021 4:21 PM

Did this Mac originally come with Mojave? Catalina was released in 10-19. If it did come with Mojave you should be able to reinstall from Recovery. Restart using Shift-Option-Command-R which should let you reinstall the OS that originally came with the Mac. Be sure you have backed up all the needed files.

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Problems not working with current macOS

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