Oppo Unkock Code. Arpan Mobile Repairing Centre.

A33f *#3988691#
A37f *#3988691#
For f1s there are threew codes, if one fails try another.
f1s *#3988700#
f1s *#3988691#
f1s *#69188692#
f1 *#3982591#
f1 plus *#3988012#
A71,F5, *#39760#
FIND 5  *#392102191#
Oppo JOY *#302121691#
Oppo F7  *#39802121451#
Oppo new A57 All *#3980612565046691#
Try these for A71 And F5, F7
*#39743#,
*#39749#,
*#39757#,
*#39760#,
Frp*#812#
Now this is master code *#3988691# if your model is not here with its own code try the master code.