[space] [space] SERVICE [space] PASS [space] OFF [space]
 

if you enter this into the password screen and hold your finger into the top left corner of the screen the unit will unlock. Seems to work regardless of the model. 
 

wont work for those who cant type but for those who forgot the pass it sure will.

 

i made an account just to send this as i myself was stumped here. I did not scroll through all 7 pages of posts so sorry if this a repeat post.