Hi. I have problem with Fiat Punto mk2 1.2 8v.

Ori ecu was IAW 59F.M2 HW002

I bought another ecu virgin IAW 59F.M3 HW303.

Car started, but wasn't running fine, so I tried to write ori file from 59f.m2 into 59f.m3. Both files were from Motorotola 29F200BB, 256kb. But at 100% I got "error cheksum write".

Now car wont start (Code ON), and I cannot write ori file back, Galletto v54 says FILE WRONG. But two files are 256kb.

Here are attached ori file from 59f.m3 when everything worked, and file readed when no start.

Hello, even if the post is old, i need to make a comm: m2 is different than m3 as the internal assembly. The pinout are different. Even if the flash/eeprom can be written from one to another ecu, the phisical architecture wouldn't change an m2 into an m3 ecu.