I've flashed it with the bad firmware I think,I've done it trough OBD2 (Galletto 1260) And now the hehicule is working well but I have no access to diagnostics,no response from controller and the same thing then it try to rewrite the original firmware.Could somebody explain me how to or give a link please.

Good evening,

it`s a good idea to write the original with an programmer.
Write the number of ECU. Maybe inside are 2 pieces of 27C1001.
They are one time programmable. You should replace them with flash,
for example 2 x AM29F010, prerecorded with original files.

Best regards,
userxoff.

desolder 29f400 and write ori file.only this way work.