Different Rom ?

[Nuked]

Can you flash a different rom (older one) over a new one succesfully?
IE: same model. same year, etc just different rom revisions.

I am particuarly speaking of a 05 LGT AT. going from a 521C rom to a 510C rom. Is this possible?

Thanks,

Jason

[NeverLies]

No problem. There is no routine to check if the version u r flashing is older than the one you have in ROM.

[Nuked]

cool, one last question..

Is there any kind of immobilizer code in the rom similar to the Evo's. Or are roms interchangeable from car A to car B (assuming they are the same model year trim etc)

Thanks,

Jason