Bypass forgotten screen patterns or FRP (Google Factory Reset Protection).
Primarily CPH2031, but also applies to CPH2015 and CPH2029. Download OPPO A31 CPH2031)EX ( Firmware4mobile com ) rar
Revert to an older version if the current one is buggy. Pros & Cons Oppo A31 - Full specifications, price and reviews - Kalvo Bypass forgotten screen patterns or FRP (Google Factory