Problems not working with current macOS

Question

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

Reply

Answer 1

Owl-53

Level 10

102,193 points

Jun 3, 2021 5:20 PM in response to JAY356

As @ tbirdvet mentioned regarding what was originally installed on the computer when it was purchased is the only version it an roll back to and nothing older.

https://support.apple.com/en-ca/HT201372 - How to create a bootable installer for macOS

About Startup Security Utility If this computer has the Touch ID Sensor this Must the Read Before attempting to boot from an external USB of Any Type.

Reply

Answer 2

tbirdvet

Level 6

17,030 points

Jun 3, 2021 4:21 PM in response to JAY356

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.

Reply

Problems not working with current macOS

Similar questions