Thank you very much, it is already solved with your help
To access the adjustment menu. Hold 1+3 while turning the key on. Screen shld power on blank. Press 3,1,2,3.
To unlock a locked screen power on the truck normally.
Press 2+5 together thren 5,2,3,5,5 imediatly after. (Theres no visual indication that the screen will be unlocked. U will just have to try some buttons, it may take a few attempts to get it)
Hold the top button down and turn the key to on. It should read PASSWORD.
1 moves up
2 moves down
3 selects enter
0312 is password. each time you get your number, press 3, enter.