do you have cm2? back up first then post here the android info...
so that we can find firmware match for this model..
this firmware is same for the device info..
samsung s20+ backup firmware
Created by Infinity-Box (c) Chinese Miracle II (c) 2017
Device Brand : Qnet
Device Model : sp7731g_1h10
Device CPU : sp7731gea_hdr
Device IntName : sp7731g_1h10_hd_oversea
Device Version : 6.0
Device Compile : 7/16/2020 10:37:29 AM
Device Project : J5_31GD3M20_hd_A001_ddr3_20200716
Device ExtInfo : Mate 30Pro
we can debrand that.. just flashing system on research development tool..
or by copying the system of this firmware and paste it to your back up, make sure save the system of your back up to a folder.in case something went wrong, we can back the system of your back up..
SP7731GEA_HDR_sp7731g_1h10_6.0_J5_31GD3M20_hd_A001_ddr3_20200716_Mate_30Pro
password: rebelgsmsandwich