Set password using HP Web Jetadmin HP LaserJet M525 MFP, M575 MFP, CM4540 MFP, and M4555 MFP. The information below is for educational use only. Calibrate the product to align the colors. I would search Google for "hp color laserjet cm4540 mfp default username and password" Then if this is a MFD, you may need to contact HP if you have lost the admin or engineer creds (come models need a bypass dongle).
I have a bunch of HP Laserjet printers here.
A cold reset does not clear the values in the Service menu, such as the serial number and the page counts.
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