First Select Boot 8th in Boot section
Second select vivo in model section
Then Make clear setting/frp
some time its shwoing system error
then do factory reset
DONE Enjoy
Tested on xt1902-2/3 & a7020a48
Second select vivo in model section
Then Make clear setting/frp
some time its shwoing system error
then do factory reset
DONE Enjoy
Tested on xt1902-2/3 & a7020a48