Hello. I reflashed ECU with wrong SW and HW version with Kess V2 Master - china. Reflash went through correctly. But after turning the ignition off and on the maxidot on dash board show immobilizer active and engine cannot start. The ECU cannot reflash back with original SW and HW map with Kess via OBD - K suite shows error during write, read went through correctly. After my friend reflash ecu with BDM - load original SW and HW map and turn off immo. But after plugging the ECU into the car and turning on the ignition maxidot shows the same - immo acive and engine cannot start. VCDS vag 15.7 - china shows errors: P160A in canal 25 immo and in the engine ECU: checksum error.

When the ECU is connected in the car, maxidot says immo active and I can't get into the maxidot menu, the buttons do not respond.

When I disconnect the ECU, maxidot does not write anything and I get to the menu normally.

Where could be the problem ? In ECU or instrument cluster immo ? Improperly switched off immo in the ECU ? If the immo in the ECU was turned on again, would it work?

Thanks for response.