I have lost the admin password, changed from default 1111, how can you reset it? or bring the machine back to factory value?
Probably not possible since you typically need to be the admin to make an administrative change, which a reset certainly is, but it is possible since the admin could have unlocked the services at some point before access was lost.
If that is the case, you will need to go to Home > Device > Resets > Reset to Factory defaults > Reset.
Technicians can reset them with a proprietary tool they run on a laptop.
Not present this option.
But whit access in Diagnostics menù (press Home for 10 seconds and pass “6789”)
In DC301 Initialize NVM - what then is the correct option?
Okay so there are two defualt passwords for the ADMIN account. They are either 1111 or the S/N.
If you don't have those then the only other option according to tech support is to pay for a tech to come to your house and use their "sepcial tool" to reset it. And if you are out of warrany then that answer might cost you $25. Whne this printer dies I will NEVER buy another Xerox machine. Brother printers are so much nicer.