So my question was. Can i buy this ecu: 022906032KT (Its from a Audi TT with the SAME machinecode BUB.) Then i desolder the flash chip and immobilizer chip from my old ecu and installed it on the new ecu?
The later ST10 ME7 ecus cannot simply be crossflashed. If you can run the software that is on the ecu, then you can use the ecu. Otherwise, no, you should get an exact match (or a tool that can write the MPC content).