You can change the password from the EWS (Embedded Web Server) interface. Just open a browser and type in the IP address of the printer.
If you don't know or lost the password, you can do a partial clean via the preboot menu of the printer. If you don't know this procedure please private message me and I'll provide it for you.
ALEX-TATS Printer Engineer for a HP Platinum Partner I am not a HP employee If you found this post helpful, you can let others know by clicking the “Accept as Solution” button. You can also show your appreciation, with a kudos, by clicking the “Thumbs up" button!