symphony v34 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 COM101
Connecting...
Mobile Status: SPRD3
Sending preloader...
Mobile Status: Spreadtrum Boot Block version 1.1
Sending mainloader...
Reading info...
Brand: Symphony
Model: V34
Device: V34
Platform: sc8830
Android version: 6.0
Custom build version: V34_HW1_V7
Internal build version: V2520AN_6.0_SYM_BD_08
Display ID: MRA58K release-keys
Searching for signatures...
Resetting FRP lock..
FRP lock is successfully reseted!
Backup saved as __GENERAL RESET FRP METHODS_SC7731 V4_29-01-2019_14-52-41.dump file
Performed by 1.6.0.0 Software version.
Thanks Octopus team