My Mac Air MI, 2020 will not install MacO8 Big Sur 11.2.1
How can I install the MacO8Big Sur 11.2.1? Something stop it from installing.
MacBook Air 13″, macOS 11.1
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You may try and see if a startup into Safe mode would help.
The installation of download should just work; maybe easier
in Safe mode. (See section on M1 Silicon in article).
• How to use Safe mode on your Mac - Apple Support
https://support.apple.com/en-us/HT201262