Download the correct .ozip firmware file to a local microSD card or copy it directly into the root directory of your internal storage. Power off the phone completely.

This comprehensive guide covers everything you need to know about downloading, preparing, and installing the official firmware for your Oppo A9 2020 safely. Understanding Oppo A9 2020 Firmware Specs

Check your PC Device Manager interface under Ports. It should register the device as Qualcomm HS-USB QDLoader 9008 . Click inside the computer flashing application.

Completely flushes the user data block when conventional screen locks are forgotten. Phase 1: Mandatory Pre-Flashing Steps

.ofp (for official service tools) or .zip (for SD card/Recovery updates) Why Do You Need to Flash Stock Firmware?