Launch X431 X-prog3 programmer is very good at ECU/TCU cloning. Here comes an example of Mercedes Benz VGS NAG3 gearbox cloning.
Launch X-Prog3 programmer
Original VGS3 gearbox
New VGS3 gearbox need to replace
*To perform ECU/TCU cloning function with X-prog3 you should have X431 PAD or IMMO series tablets. X431 V/V+/Pros with X-prog3 won’t do ECU cloning.
Select IMMO Prog function
Connect X-PROG3 with IMMO Plus (connection instruction)
Select Gearbox->Benz->VGS-NAG3->View Wiring Diagram->Connect to MCU3 adapter plate
Do a Backup full data
Read and save flash data
Backup full data of the new VGS NAG3
Select Restore complete data
Update original VGS data to restore
Make sure Bosch bumber of the new ECU is the same from that of the original ECU.
Write eeprom and flash to new VGS3