Hi the last suggestion fixed the problem. It works even with boot USB for clean installation. Thanks.
GianniV
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Hi @kh4inguyen, do you know if that solution works even installing Big Sur from USB from boot? Thanks
MacBook Air 2020 13'' - Running Catalina 10.15.7:
Having the same problem at 12 minutes.
Also, I created an USB for fresh install, but it stop and says: "to use this boot disk you need an update", I click on "update", but the problem persists.
No way to install Big Sur.
I tried the suggestion to reset the NVRAM, I tried also to stop FileVault. The only thing I haven't tried is reset of SMC.
I don't know how tomorrow they can officially release.
I tried to run the fresh install from USB in another MacBook Pro (2015), and there it's run.