[aladinnu]

My guess is that even if ecu has been opened before and unlocked (probably with another tool that kess couldn t identify as UNLOCKED), and you did a second Unlock procedure on a already unlocked eeprom. the unlock is done starting from adress 240x0A till 250x01.
So recovering ori ecu depends on reverting string 74 34 a6 90 8d 34 49 6c to a lock procedure. that will recover ur ecu 100%

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Give it a try on ori ecu. my advice, use Kess, solder resistors and try this:  connect Boot wire to case of ecu when make ID. but do  not disconnect boot wire from its place from board. just make a jumper to ecu ground case. good luck.

also u can try read eeprom using a reader as xprog...but not on board my advice. not all readers can read onboard.