Unofficial builds are available through community developers like LineageOS 18.1 (Android 11):
Android Enthusiast Labs Reading Time: 8 Minutes Oppo A37fw Custom Rom
Flashing an unofficial custom software image allows you to bypass the heavy, outdated software skin. It replaces it with an optimized, lightweight alternative. Best Custom ROM Options for Oppo A37fw manages its 2GB of RAM
for a privacy-focused Android 11 build specifically for the A37. Oppo A37 Official Telegram Channel to get the latest unofficial builds and community support. Oppo A37fw Custom Rom
The choice of software determines how your phone handles daily tasks, manages its 2GB of RAM, and preserves its 2630 mAh battery. 1. LineageOS 17.1 (Android 10)
This option is widely considered the most balanced software available for the Oppo A37fw