All 3 are already softmodded and 2 have been updated to 11.4 but I only did two personally so I wasn't sure what the 3rd was on (A9LH or B9) so I just wanted to know if there was a way to check.
It has boot.firm on the root of the SD card and I can boot to godmode9 and luma is on the latest version.
So I'm guessing I should just make a nand backup and then I'm safe to do a system update or is there anything else I should check or do first?
if it says luma 8.1 when you boot with select held down then you're fine to make a NAND backup and upgrade.