Tips to Clone Audi Simos 8.51 ECU with Launch X-prog3

Here is the user working experience and tips to clone Audi Simos 8.51 ECU with Launch X-prog3.


Trying to clone a simos 8.51 module ( from a 2013 Audi A8 ctub) with the Launch X431 IMMO Plus with x-prog3.


You can see simos 8.5 is supported and he successfully backed up the eeprom and flash from the original ecu and loaded it into the donor but the vehicle does not start and has a fault code saying the immobilizer is active and ecu is locked.

He even tried it with the topdon phoenix same thing. Additionally, when you auto scan the vehicle with the donor module installed it now says eeprom while trying to pull the vin.

Launch X Prog3 Clone Simos 8.51 2

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Tips 1:

For Audi ecu you have to navigate to the year make module under scan then special functions-> antitheft and in there it shows you to pull the original ecu data and the donor data and it needs to be decrypted.

He went under service and immo prog which doesn’t tell you this and that screwed him up because he corrupted the donor ecu data flashing over it without saving it first lesson learned.

Then he was able to decrypt the original ecu data and program the donor on the bench and the vehicle starts / runs and has a vin number but now has a P160A fault code.

Launch X Prog3 Clone Simos 8.51 1

p160A says to reprogram and code ECU and test.

He did try reprogramming and updating the software level.


Tips 2:

It is the otp. You lost original pflash. You should not try to write whole p&d flash directly. Just immo data to clone VW ECU.

VW ECU has OTP area. So when need to clone vw ECU. Decrypt file and change just pin, Mac, CS, VIN (depend on which ECU you’re working with.) Some are just vin&cs.

Pay attention on password.