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While may roms are compatavle their are differnces. Usa roms have evap systwm pressure input where europe and australia do not. The engine will run but it will throw cel codes.
Its safer for conpaies like ecutek to use the same rom that cam out of car originally to tune car. Even though thier may be compatable roms. It would take too lng to test compatability on each rom
Some roms are also factory updates example
400C, 700C A00C, A01C, B00C and B01C were all updates , so the best rom to run is latest update in tgis case B01C if your USA manual car same in australia but rom series was 700G, 00G, A01G A02G
Some roms are backwads compatable some are not for example you xan run A01G in a D00G car but not the other way round
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