machine data on the 8 series mfps. is stored in at least 3 locations the emmc the flash roms on the mfp/driver board combo(once in each section) and counter/life on the removable roms. if 2 of the datasets do not match from what I've experienced you get a blank machine. in this case toner, drum and developer counts are messed up. Toner control and image quality are gone, may even empty developer units during startup. I have found that if life counts are wrong by more than 30% trouble of some sort will rear its head. Also in play is the identity board(service rom)here is the sn and licenses for the unit.
There is no documentation i can find on this. all info above is from learning the hard way.
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