OSMC's September update is here with Debian 11 (Bullseye) - OSMC

Same issue as some others on two Vero 4K+ initial update with a reboot where it sat booting for a bit and timed out trying to sync network time, but then it booted into the March version

Second update worked perfectly, mine are both wired connection so something funky happing on first attempt.

My setups don’t have any add ons of any real customised stuff except Windows shares and using the confluence skin.