Oppo A37m - Mt6755 Firmware [verified]
Official firmware ships with Android 5.1.1 (Lollipop) with ColorOS 3.0 or Android 6.0 (Marshmallow) depending on the regional update.
: Download the specific OPPO A37m MT6750/6755 Flash File (ensure it is the "Scatter-based" version for SP Flash Tool). oppo a37m mt6755 firmware