The safest and easiest way to update your device is through the official OTA (Over-The-Air) method provided by OPPO. Check via Settings on your device. Scroll down and select Software Update Wait for the system to check for available updates. If an update is found, tap Download and Install . Ensure you are connected to and have at least 50% battery before starting. Using the OPPO System Upgrade Tool

If your phone is running slow, try clearing the app cache or updating apps through the Google Play Store before resorting to a full firmware re-install. of ColorOS, or are you trying to fix a specific software problem like a boot loop? Update software – OPPO A5 (2020) - Android 10 Guide

on a PC. Connect your phone via USB and follow the on-screen prompts to flash the official stock ROM. Check Software Info

If you are looking to manually flash your device to fix a software issue (like a boot loop): Chipset Matters OPPO A5 2020 Qualcomm Snapdragon 665