To use secret codes on the OPPO A9 2020 app, navigate to the dialer, and type the specific code as if you were making a call
*#43# then tap Call.*43# then tap Call.#43# then tap Call.This code prompts a total factory reset (wipe all data, logs, settings). Unlike the Settings menu, this does not ask for a password if the screen is unlocked. Back up your data before using this. how to use secret codes on oppo a9 2020 upd
| 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). | To use secret codes on the OPPO A9
*#*#4636#*#* — Phone Info: Provides real-time data on battery health, usage statistics, and Wi-Fi signal strength. Check Status: *#43# then tap Call
# or restarting the dialer.Code: *#899#