hello, can anybody help me (sorry for my english)

i had flashed my audi a3 105 hp Diesel with a file with wrong checksumm.

before i did a backup OBD backup with Galletto 1260 and file is okay.

as the car dont starts with the wrong file i tried to write back the original but it fails.

now i cannot flash anything to it. there is no reaction of the ecu :|

i tried to write with mpps , kess v2 and Galletto 1260. there is no chance for me.

is there any better chance ?

the Bosch nr is the bosch nr. is 03G906016J

and this i read with galletto

Reveals the ECU and write through the BDM interface BDM100, Galletto 2 v54.

recovery whit mpps, or fgtech v 53 or kess test

Got the same problem with the same car and the same part number. Someone flashed the ecu of a friends car. Now the car dont start. During flash there was no error. The backup was corrupt. Now i ont have communication to the ecu via obd, but i read out via ktag. Also i found a full bdm-backup for this type of ecu on the internet. Can someone help? Should i flash the flash file from the bdm of the internet to the ecu from my friend?