Go to Settings > Developer Options > Enable USB Debugging.

Oppo A37m Global ROM: Everything You Need to Know**

A global ROM is a customized version of the Android operating system that is designed for international users. Unlike the China-specific ROM that comes pre-installed on many Chinese smartphones, a global ROM provides a more comprehensive language support, Google services, and other features that are not available in the China-specific ROM.

Connect your Oppo A37m to the computer using a USB cable.