No service (No signal) of models above mentioned can be caused by FEMid defect - Check the below items to verify the root cause whether FEMid component or not. Enter Dial mode > Input *#0011# > Service Mode 1) MIPI DEVICE FAIL 2) DEVICE MID=0x20c, PID=0x008 settings activate this phone vol- vol- vol+ vol+ vol+ vol- [shows the service mode] testmode->settinginfo->setting->system->nv_backup_test->efs_clear&restore reboot I tested it only in sprint handsets, dont know others, android 7 does not shows this service menu, you need to downgrade to 6 within the same rollback bit protection. Hope it helps. if its showing 2 options exist a golden backup backup type = secure_hw The Solution for MIPI DEVICE FAIL is to Downgrade 7.0 nougat to 6.0.1 PL6 marshmallow. And then to go into Settings>Activatedevice>Vol-vol-vol+ Vol+vol+vol- hidden menu. Select test menu Find the GSM CDMA Selection. Enable GSM. Restart. The network will be back
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