Here’s a clear, helpful, and safe guide on how to use secret codes (also known as USSD codes or engineering codes) on the , especially after a software update (ColorOS 11 or 12 based on Android 10/11).
If you have searched for , you are likely looking for the latest, working codes to test your hardware, access advanced settings, or recover information. This updated guide for 2025-2026 provides a complete, step-by-step walkthrough. how to use secret codes on oppo a9 2020 upd
Shows the hardware revision and PCB (mainboard) serial number. *#07# Here’s a clear, helpful, and safe guide on
Displays real-time battery statistics: voltage (mV), temperature (°C), and state of health. Note that OPPO doesn't show cycle count here, but you can see if the battery overheats. Here’s a clear