Same here oct 25 2023 release of 12.7.1 killed my bluetooth. Won't even turn on. ran a variety of things with apple support on Oct 29th.
NV ram reset
Safe mode
reset SMC
Mac os recovery took a while
Called again
test user
Diagnostics nothing reported
I was told they could help me at the apple genius bar.
Then I begged for higher support advisor to assist
we did plist deletions (Worked for a short time) then suddenly stopped again today 11-1.
Called apple support again. given the run around, we don't support your computer we can suggest third party repair options.
I again asked for a higher level advisor, denied "we aren't trained for your computer"
I filed a complaint that if they are going to push an update for computers that they don't support there should be a disclaimer or they should just not support those computers and block people from updates.
I was told that the apple genius bar WOULDN'T help me, contradicting the previous advisor.
EVERYTHING WAS WORKING GREAT UNTIL THIS OS 12.7.1