2x Mac M1 OS Corrupted with 12.3.1 update (21E258)

OSX12corruptedm1 Said:

"2x Mac M1 OS Corrupted with 12.3.1 update (21E258): [...]The Macbook Air couldn't find the start-up disk after restarting once the update was done, and the M1 Pro after the update corrupted the the start-up boot, requiring a revive from another M1 to get the system back-up.[...]"

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Mount the Drive:

Seems as if the drive became unmounted, somehow. Boot into Recovery Mode (Intel or Silicon) . Then, using Disk Utility, see if the Hard Drive or installer are seen. If so, then see if you need to click the “Mount’ button for them. Try rebooting once more. If of no success, then click unmount button, and then the mount button. Try rebooting once more.

I just did the 12.3.1 update on a 2020 M1 MBPro and also experienced something weird. It seems to have loaded the desktop from some other profile. It changed the name of the Start Up drive and loaded some older desktop files I sort of recognize. I signed in and out of iCloud and that got rid of the older desktop pdfs, but did not restore the HardDrive name. I don't think I lost anything...I can't really tell as this is a new to me MBPro 13".

It seems to be working ok. I may have complicated my life as I was also reconfiguring an older MacBook Air at the same time. Perhaps the "dueling" applications to sign onto my iCloud account caused my 12.3.1 issue. Who knows? Really ,very very strange.

Had an unexplained loss of Outlook and system lost ability to update ANY application even Apple's own ones.

Does anyone have a suggestion of what to do now?

I did the update in February so will I lose data created since then if I get the OS before 12.3.1 re-installed?

greg h

It leaves me unable to log into secure

accounts ?