For enable DIAG port in Android 5.x use this instruction:
277634#*# -> Port check Test -> set Enabled. Reconnect device.
Mode: Normal
Model: EAAAANVZ
Build version: Apr 17 201512:53:31Mar 10 201506:00:00EAAAANVZ
SW Version: MPSS.DPM.2.0.c11-00014-M8936FAAAANUZM-1
IMEI: 35838706130947-1
BlueTooth Address: 00:00:00:00:00:00
Phone Code: default
Elapsed: 0 secs. --> (v7.8)

This phone are not supported , or can be unlocked by patch


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