For anybody which have the same error, this is the procedure to enter in the service menu:
Keep pressed "lamp" button when rotating the key
Insert code 2085, confirm with M every number, and keep pushed for some seconds to enter in the service menu
To modify a value, press lamp, change it with F1 and F2, and confirm keeping pushed M for 10s, it'll say "OK" when it saved the value
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.