| if is qualcomm cpu,you can power on mobile cpu,and in the call input *#801# open diag port
use qpst read back and write qcn,for repair nv
and frp,just flash it then finish
case is oppo frp very easy for remove
it just add in the userdata,
but oppo firmware now is encryption
you only can flash by oppo factory tools
and if is mtk cpu
mrt mtk tools can read flash \write flash\format\... |