g928g frp issue

i am using ufs method for g928g patch level january 2018

but always getting error:-

Hold 'Vol down' and press 'POWER ON' for 2-3 seconds
Checking phone at COM6 OK
Phone detected, do not release 'Vol down'
Reading data from phone... error (2)

Done with Samsung Tool PRO v.30.8

help z3x team