These are the unlock codes for Oppo machines. Please note: The code below will not work on 2017 security patches (ie, machines have been updated to 2017 software):
A33f * # 3988691 #
A37f * # 3988691 #
For Oppo f1s, You try these 2 codes
f1s * # 3988691 #
f1s .. * # 69188692 #
A37.f1s ALL .... * # 3988691 #
F1 * # 3982591 #
F1 + * # 3988012 #
R5 * # 3988341251 # FIN
FIND 5 * # 392102191 #
OPPO JOY * # 302121691 #
OPPO S7 * # 39802121451 #
OPPO * # 3980612565046691 # NEW..A57 all
and finally the master code * # 3988691 #
If your machine model is not named in the list above, you try entering Master code above
A33f * # 3988691 #
A37f * # 3988691 #
For Oppo f1s, You try these 2 codes
f1s * # 3988691 #
f1s .. * # 69188692 #
A37.f1s ALL .... * # 3988691 #
F1 * # 3982591 #
F1 + * # 3988012 #
R5 * # 3988341251 # FIN
FIND 5 * # 392102191 #
OPPO JOY * # 302121691 #
OPPO S7 * # 39802121451 #
OPPO * # 3980612565046691 # NEW..A57 all
and finally the master code * # 3988691 #
If your machine model is not named in the list above, you try entering Master code above