Flashing a "fixed" ROM on the A37m requires a specific technical path because the bootloader is often locked by default: OPPO OPPO A37m - Geekbench Browser
The Oppo A37m is a legacy MediaTek-based device (MT6750). It has limited official custom ROM support due to MediaTek’s historically closed source code. However, the developer community (mainly on sites like NeedROM, Hovatek, and 4PDA) has produced several from similar chipset devices (e.g., Infinix, Tecno, Micromax). The most stable ROMs are based on Android 6.0–7.0 , with experimental Android 8.1/9.0 builds often suffering from major hardware bugs.
Before installing any of these ROMs, you must meet specific requirements.