Hi, i'm newbie in those things and need to do a immo off in that car.

I have read the eeprom with mask 82AD 2565, that i think is a M95040, change all to FF except the chassis number, write into eeprom, but with the key reader conected the car doesnt start.. i connect that and car starts... After a few times the problem comes again and doesnt start. I am doing something wrong?

Ecu: Chrysler P04606675AE

Can someone help me?
Thanks