Power down the unit and with your right hand hold down the 1 5 9 and enter keys down. While those keys are pressed down with your left hand turn on unit it should take you to that nos loader menu. Once in the nos loader menu choose back to NOS password is 1947. Once in the NOS menu choose number 6 Service Menu
then 1 Hardware test
then 15 RAM test this will state this terminal will self destruct continue. Hit enter and it will create a new RAM disk once you see the date & time if correct hit ESCAPE if not correct D & T hit enter then put the correct info in Military time MM/DD/YY format. Hit enter and it will take you back to your main screen with the original password of MMDDYYYY that is your password.
There should be a reset button in the battery compartment on your machine, that would reset back to factory settings.
SOURCE: I have a verifone nurit 8020, When i go to reset
i had the program that resolved the tamper and tampering problem if you like you can add to you messenger thanks....
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