Basic method:
Tap Setup > Printer Maintenance > Restore > Restore Factory Defaults > Restore
The dialog box warns:
Undocumented methods:
Press Back/Return arrow 4 times > Support Menu > Resets Menu > Country & Language reset, Partial reset, and Semi-full reset
Press Home, Back/Return arrow, Home, Home > Engineering Menu > Services Menu > Resets Menu > Country & Language reset, Partial reset, Semi-full reset, and OOBE reset (Out Of Box Experience)
Press Home, Back/Return arrow, Home, Home > Engineering Menu > Underwear Menu > system menu > clear nvm, clear firms, clear scan list, and clear derivative
Notes
According to Three Types of Resets for your HP Officejet 6110,
states that none of these worked to reset the administrator password on an HP Photosmart 7510 e-All-in-One:
Partial Reset
Semi-Full Reset
OOBE Reset
Full Reset
Clear derivatives
The clear nmv option returned It is not the default serial number Failed to reset NVM. Changed the serial number to all zeros on a whim to no avail. However, angerion explained how to dump and overwrite the NVM on an HP Photosmart C4480; the options are located under Engineering Menu > Underwear Menu > photo menu: dump nvm=>file and dump file=>nvm.
While I was able to dump the NVM to an SD card, attempting to write back a zero-filled NVM2_RAW.DMP returned error 0: unsupported. Renaming to any other filename (including NVM_RAW.DMP, which angerion used) would return error: bad file /fs/sda1/NVM2/NVM2_RAW.DMP.
Support and Engineering main menu entries
Support Menu (Press Back/Return 4 times)
Support (Displays current firmware version)
Information Menu
Resets Menu
System Configuration Menu
Fax Diagnostic Menu
Print Diagnostic Menu
Connectivity Diagnostics Menu
Reports Menu
Scan Diagnostics Menu
Enable/Disable Menu
Some potentially useful/interesting options:
System Configuration Menu > Hardware failure status > OK to clear hardware failure status
Enable/Disable Menu > disable Fax, Fax reprint, Color fax (incoming), or Webscan features
Engineering Menu (Press Home, Back, Home, Home)
Manufacturing Menu
Underwear Menu
Services Menu
Fax Regulatory Menu
Extended Self Test
Country & Language
Some potentially useful/interesting options:
Manufacturing Menu > product usage menu > page counters
Underwear Menu > boot code menu > set to mfg_mode and set to user_mode (Booting into mfg_mode displays a grid pattern on the LCD. Pressing the power button returns the printer to user mode.)
Services Menu > System Configuration > Change serial number, Ethernet MAC address, and wireless MAC address
Services Menu > Service Tests > De-activate door sensor
@Partialreset @Semifullreset @OOBEreset @Hp @HPprinterreset @RestoreFactoryDefaults
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