To use secret codes on your OPPO A9 2020 Go to product viewer dialog for this item.
Here are some of the most useful secret codes for Oppo A9 2020: how to use secret codes on oppo a9 2020 upd
Below is a list of the most useful diagnostic and informational codes for this specific model: Displays your device's unique identification numbers. Engineer Mode To use secret codes on your OPPO A9
Troubleshooting: If a code doesn't work: how to use secret codes on oppo a9 2020 upd
The process is simple and works exactly like making a phone call: