I Purchased NEW THIS PRODUCT HP LASER JET PRO 400
default must be no password , here are the steps to reset the printer
NVRAM reset for the HP LaserJet 400 colorMFP M475dn (Confirmed functional) 1: Print configuration page before beginning reset
2: Disconnect all cables except for power
3: While printer is in ready state, note the position of "Ready" message on the screen (Probably bottom right)
4: Power off the printer via power button
5: Touch the location on the screen where "Ready" message appeared.
6: while touching the screen, power on the printer. Continue to hold the screen.
7: When "Memory Limit Reached" message appears, release the screen.
8: Printer will reboot, clean and calibrate
9: Return cables to their appropriate ports
10: Print configuration page to confirm settings are cleared. Restore settings desired manually.
Finally have access back!
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