If your phone is truly bricked, spend $10-20 on credits for a professional tool. They include verified loaders.
Oppo A5 2020 ) runs on the Qualcomm Snapdragon 665 (SDM665) chipset. To perform operations like flashing or unlocking, you typically need a specific "firehose" programmer or loader file. Loader & Firmware Details The loader file is usually part of the official stock firmware or "Flash File." Qualcomm Snapdragon 665 (SDM665). Model Variants: Firmware Type: (official firmware package) or Supported Tools: oppo a5 2020 loader file
OPPO implemented Anti-Rollback protection on the A5 2020. If you flash a loader/file/firmware that is older than your current version, you may trigger the ARB fuse, permanently bricking the device. If your phone is truly bricked, spend $10-20