For reset power switch and hold volume down
Then format data then after ma-wipe auto reboot na ang unit
For frp
Open UT select tab oppo then search oppo a18
Tick brom|edl
Click erase frp then wait
Or
Pwede rin Rekta na, click lang yung factory reset+erase frp then power off ang unit tapos hold volume up and down at salpak na yung usb cable tapos wait nyo na lang mag success at mag boot and setup na lang ang phone
Then format data then after ma-wipe auto reboot na ang unit
For frp
Open UT select tab oppo then search oppo a18
Tick brom|edl
Click erase frp then wait
Or
Pwede rin Rekta na, click lang yung factory reset+erase frp then power off ang unit tapos hold volume up and down at salpak na yung usb cable tapos wait nyo na lang mag success at mag boot and setup na lang ang phone