I open an ECU EDC17CP20 of T5:
1.Read it by Ktag in boot mode
2.Close ECU and insert back to car
3.Ask/Try Tprot off
4.Write ECU via OBD with Kess
5.ECU is read-/writeable via OBD with Kess
Could please somebody tell me if my way is true or wrong (if any why)?