How to factory reset M277C6 Laser Printer

[locarvey]

My WiFi SSID changed and I cannot access the WiFi Setup Wizard.

It prompts for old WiFi password to old SSID, which no longer exists for authentication.

When I use menus to access Settings and Factory reset, it also prompts for password. 

When I plug in USB, nothing happens or is acknowledged.

I want to remove saved SSID so Wizard will re-engage. 

[locarvey · Accepted solution]

How to Factory Reset HP LaserJet M277dw Printer:
1 - Power Down
2 - Power Up
3 - Wait until you see the energy logo
4 - Press and hold the lower right hand portion of the display
5 - You can release when you see "permanent storage init"

These steps worked for me.