Car is a 2005 E320 v6 sport (uk)
Im trying to access the secret menu in engineering mode, my sequence to get into engineering mode is:
Go into serv then language then Mute+callend+diganal left arrow up+audio : engineering mode
But my problem is ive tried most things i have seen to get the secret menu up but its not having any of it does any1 no the right sequence ? Thanks

 

mute-service-end in that order and hold for 10 sec

 

Is that to get into engineering mode ? or to pop up the secret menu when in engineering mode ?