12.3.1 download stall

Try booting to Safe Mode. That boot up takes minutes and clears caches and other things that may resolve your problem.

How to use safe mode on your Mac - Apple Support

Try downloading and installing the update while in Safe Mode.

celinefromadelaide wrote:

my brand new mac24inch is not allowing update to 12.3.1. I keep getting message "failed to personalise the software".

have tried all I know but am I missing something?

Thank you

see if this gets you going

If an error occurred while updating or installing macOS - Apple ...

If you are still at a loss‚

Revive or restore a Mac with Apple silicon using Apple Configurator - Apple Support