Because official updates were limited, the community developed several alternatives:
Do NOT flash Android 8.1 (Oreo) or Android 9 (Pie) GSI ROMs on the A37f. The MediaTek MT6735 lacks proper GPU drivers for Android Go or higher. You will lose camera, video playback, and face extreme lag. Rom Oppo A37f Android 6.0
Android 6.0, also known as Marshmallow, brings a host of improvements and features that enhance the overall user experience. Some of the key benefits include: Because official updates were limited