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OPPO started locking bootloaders tightly after Android 9. For newer OPPO A5 models, you need the app.

Using (if bootloader unlocked):

Boot into the stock recovery menu by holding Power + Volume Down during startup. Select your language, choose Wipe Data / Format Data , confirm the command, and restart the phone. Post-Conversion Checklist and Benefits

OPPO devices typically use the for flashing, which is an internal tool that bypasses the operating system to flash raw images.

The OPPO A5 generation features both Qualcomm Snapdragon and MediaTek hardware variants depending on the specific model code. You must verify your exact device architecture before downloading software tools. Dial *#6776# into your phone's dialer application to view your specific software branch information.

Download the corresponding MSM tool for your device. Run the Tool: Open the MSM Download Tool ( .exe ) on your PC.

A mistake in the flashing process, an interrupted connection, or using the wrong firmware file can permanently "brick" your phone, rendering it completely unbootable.

Get CPH1923 stock ROM from OPPO firmware sites (ensure it’s for your exact hardware version)

Official OPPO flashing tools frequently require authorized service center accounts to log in. To bypass this, search developer forums like XDA for a "cracked" or patched version of the MSM tool specific to your device project code.

Navigate to > Advanced Options > Startup Settings > Restart .