AFAIK, A500 Revs 6A and later are ready for 2.04. For Rev 3 and 5 you must connect pin#1 and pin#31 on ROM IC.
My friend has all 3 mentioned revs, so he got DIL40 IC extender and performed that operation on extender, avoiding soldering on PCB or even worse, ROM.
Maybe you should check-out from more source, before actually making some mods.
