Well, just compared two F200 - the new ones have a much brighter LCD with less scanlines than the old one.
So I guess the old firmware won't work because of LCD drivers.
Gonna open them up and check it out.
EDIT: Old F200 have a different Testing-Points layout on the PCB than new F200. Definately a hardware change.
EDIT2: Yep, as suspected, the new F200 have a completely different LCD!
The old one is the same as the F100 MK2 (just with a touchscreen foil in front of it) and the new one is a LG Philips LCD LB035Q02 - V0.3. Completely different layout on the frontside of the PCB.