How to enter Qualcomm mode for some models. Read here please
 

some model don't go into qualcomm mode with *#782872#

then try next it worked for me on ZV30 and z500(v)

-Power on phone without simcard.

-Enter code: *#123580# phone goes into testmode
-Then press 9 then press 6 key
-If Qualcomm USB (2)is selected then press OK, if not then press 2

Your phone is now in qualcomm mode

If it work's hit thanks Greetzz:D