ROM Compatibility

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Hi,

could anybody explain if there are any issues concerning compatibility between different roms of certain brands, please?

I have an early T-Mobile MDA Pro:
ROM-Version: 1.12.43 GER
ROM-Date: 08/23/05
Radio-Version: 1.00.02
Protocol-Version: 42.33.P8
ExtROM-Version: 1.12.127 GER

Due to poor reception I am about to update radio rom
but bothered about that compatibility issue.
In the ftp site there is some jasjar stuff,
but may I use that without giving a weekend getting it working again :roll:

Would be nice, if anyone could get some advice.
Greetings
michael63