OS 6.0.1 , does not work or get diag mode

[ahmad83it]

dear

i have installed latest updates of marshemelow 6.0.1 , but i want to enable gsm and 4g bands so i need to qpst compatble but diag mode does not work

anybody have an idea?
thanks

 

[Youdoofus]

ive never seen diagnostic mode work for MM