Now installing 14.5b2 OTA over b1...
EDIT: installation finished all automatic. Closest-match KDK used in root patching is the one from b1. System running fine.
Oops, I've just realized I do have something to report: Wifi is broken on my MBP5,2 with 14.5b3, didn't notice as I was on ethernet lately so I can't tell if it's just b3 or already on b2, but apparently hvds above didn't have any issue on b2.
Have reverted the 1.5.0n root patch and reinstalled 1.4.3 and repatched (and resetted SMC) to no avail.
Is there anyone running b3 on some non-metal machine with Wifi working ?