I guess you have tried the default code 1234. I have tried to reset the units for people in the past and even removed the eeprom chip and cleared the chip and the code still was saved. I am not sure what memory register because I tried for someone and the way he got his unlocked was to try every combination but he figured out the code after only a week. The Interceptor I, I am sure using the same passcode system as the Interceptor II and since nobody supports our units and the passcode system is different than the new PMS so no help on that front.