HP Printer C4280 Special key Combo/Service mode

I found this online for getting into a special menu for my printer:
1 - Hold the power and cancel button down (X)
2 - When it say enter special key combo press Blue, Green then Grey.
3 - Press BLUE again twice, now it says resets menu.
4 - Press the OK button and press blue twice to get to semi-full reset
5 - Press OK for semi-full reset, printer should shutdown. Wait for 30 secs before turning it back on using the power button and follow the prompts to set the language and the country. If this won’t work, then you need to replace cartridges.

where can I find more information about these menus? - it isn't mentioned in the manual
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