@astrodeveloper I have been running a Pi4 for some time now on Debian 11 (Bullseye) and noted that Bookworm is supported by the Pi4, so upgraded to Bookworm by ssh’ing into the Pi4 and doing it that way - works a treat.
The Raspberry Pi website lists the 32-bit version of Bookworm as compatible with All Raspberry Pi models - see here, but with any major upgrade of this type, make sure you have a backup of the /boot/piaware-config.txt file before starting - just in case!
