"1202" would be an unusually old hardware revision--probably a prototype. There's been some discussion previously on N800 hardware revisions.

EDIT: As for the OP, Texrat once provided a firmware update that might help you. T'was either beta OS2008 or OS2008 final, and from what he said, it was the same as the "normal" firmware of that release except that it could be installed on a much greater range of hardware revisions. If memory serves, he provided the firmware to someone else who hosted it for the world at large. Someone may still have a copy lying around.

EDIT2: I've located the post where Texrat wrote of "legacy" vs. "combined" firmware. For a 1202, you might find happiness with a "legacy" firmware. Unfortunately, Texrat may have only made the N810 "legacy" firmware available, and you may have difficulty finding even that at this point.

Are you able to say how you came about owning a 1202 N800 or write briefly on any differences you can notice between it and the more common 1301 N800?