Oppo A77 (Mediatek official Pictures. Oppo A77 (Mediatek is a Smartphone of oppo. The Oppo A77 (Mediatek) Android Smartphone. Announced May 2017. Features 5.5″ Display MT6750T Chipset 13 MP Primary Camera 16 MP Front Camera 3200 MAh Battery 64 GB Storage 4 GB RAM. Oppo A77 (Mediatek price starts.