Meaning delete the internal SSD completely and install Monterey from the flash drive. If not you can boot from the flash drive and nuke and pave.
#Macos monterey update stuck on apple logo how to
How to create a bootable installer for macOS - Apple Support then you can attempt to let it boot normally and see if the upgrade completes.
Booting from a flash drive means the internal disk is not in use and you can unlock it (if encrypted) and repair it far more effectively if the recovery partition is not being used. Try the command line fsck_apfs command if Disk Utility cannot repair. Boot from that and use Disk Utility to run first aid on each APFS volume, then the container and then the drive itself starting from the bottom and working your way up. Build a macOS Monterey installer flash drive using a second Mac.Still possible you have unrepairable hardware or soft damage to the SSD files. This is the same things as First Aid but there seems to be a bug in Disk Utility where it's not working properly but the command line fsck_apfs has been known to succeed. Boot into Recovery Mode, open Utilities -> Terminal and list the disk identifiers with "diskutil list" and then run fsck_apfs on each of the internal SSD disk identifiers such as /dev/disk3s5, etc.Do you have a backup of your data via Time Machine or a full disk clone using CCC - Carbon Copy Cloner or SuperDuper?
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