Réinitialiser hp c4480

I have the solution obtained from the hp website from a technician

1- Press “Cancel” & “power” simultaneously; A message enter Special Key combo will display on the screen.
2- Press “scan” (blue), “color copy” (green), “black copy” (gray) in sequence.
3- The message “service RL00XX” will appear.
4- Scroll down to “Reset Menu,” and press “OK”
5- Scroll down to “Country/Language Reset” and press “OK”
6- The printer will turn off, turn it on by pressing the “power” button: a prompt will ask you to select the language

NB: To scroll in the Support Menu, use “scan” (up) or “black copy” (down). To confirm a choice, use “color copy” (OK)
Christian Dion: I searched the web but I couldn’t find the answer, I saw that other people were asking the same question.
Christian Dion: yes, but how to start since my printer is in English, I must have made a wrong manipulation.
Firdaousse: use the manipulation above to switch it back to French
Firdaousse: is it done?
Christian Dion: I don't have the RLOOXX message but something else
Firdaousse: scroll with the blue button
Christian Dion: I didn't succeed, I will try again because it's still in English
Firdaousse: okay, first press “Cancel” & “power” at the same time
Firdaousse: then press the “scan” (blue), “color copy” (green), “black copy” (gray) buttons one after the other
Christian Dion: okay it works.