innjoo Halo2 3G frp remove done with Selected model: SC7731 V4 
Platform: __GENERAL RESET FRP METHODS
Selected model: SC7731 V4
Please, reconnect battery, press and hold "Vol+" or "Vol-" button and connect USB cable.
Searching for a phone. Please wait...
Found phone on COM6
Connecting...
Mobile Status: SPRD3
Sending preloader...
Mobile Status: Spreadtrum Boot Block version 1.1
Sending mainloader...
Reading info...
Brand: InnJoo
Model: Halo2 3G
Device: c178_hwf_263
Platform: sc8830
Android version: 7.0
Display ID: NRD90M release-keys
Searching for signatures...
Resetting FRP lock..
FRP lock is successfully reseted!
Backup saved as __GENERAL RESET FRP METHODS_SC7731 V4_03-02-2019_17-39-25.dump file
Performed by 1.6.1.0 Software version.
Thanks Octopus team