Instruction for admin password reset for hp color laserjet M855 PCL6 Please

[xDrayn]

I bought the printer but there is the admin password from the owner and he doesn't know it anymore either. How do i reset the password now.
When I started my old one, I just had to keep my finger on it at the right botten corner to get into the admin configurations. I don’t know how does it works by the M855.
Thanks in advance.

[Valsimot · Accepted solution]

When you turn printer On and round HP logo appears on the screen press and hold HP logo to enter the preboot menu where you can reset password or cold reset the printer.