Code: *#*#34971539#*#*
Opens a camera firmware menu. You can verify your camera sensor type (e.g., Samsung GM1 or GW1 for main lens). Do not update firmware via this menu unless you have the correct file.
The OPPO A9 2020 is a powerful mid-range smartphone known for its massive battery, quad-camera setup, and smooth ColorOS interface. However, like most Android devices, it hides a treasure trove of diagnostic tools, test menus, and engineering screens behind a series of secret codes (also known as USSD codes or MMI codes). how to use secret codes on oppo a9 2020 upd
If you have searched for "how to use secret codes on oppo a9 2020 upd", 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. Code: *#*#34971539#*#* Opens a camera firmware menu
⚠️ Warning: Secret codes give access to system-level tests. Do not change values in "Engineering Mode" or "Device Test" unless you know exactly what you are doing. Incorrect settings can affect your phone's performance. ⚠️ Warning: Secret codes give access to system-level
| Code | Function |
|------|-----------|
| *#06# | Show IMEI numbers (for device identification). |
| *#888# | Show PCB / hardware version info (sometimes works on Oppo). |
| *#1234# | Show software/firmware version. |
| *#6776# | Full device information (model, build date, Android version). |
| *#*#4636#*#* | Phone info, battery stats, usage statistics (Android standard). |
| *#*#3646633#*#* | Engineer Mode (hardware testing for sensors, touch, display). |
| *#*#6484#*#* | Hardware test (vibration, speaker, buttons, camera). |
| *#*#232338#*#* | Show Wi-Fi MAC address. |
| *#*#2664#*#* | Touch screen test. |
| *#*#3264#*#* | RAM version info. |
| *#*#225#*#* | Calendar & storage info (Google Calendar events). |
| *#*#426#*#* | Google Play Services diagnostic (check GMS connection). |