I think these phones have the most current firmware.
In the g920v the firmware is g920vvru4bog9.
I got the z3x box yesterday and installed everything properly.
The error message i am getting is "unable to read PIT"
For the G900v I am not seeing a button to reset the FRP.
g900v firmware : G900VVRU2BOE1
I still have yet to see this box work for me.
- sm-g900v frp unlock gsmhosting