– Manual Hardware Test : An alternative engineering menu for specific manual component tests.
| Purpose | Code | |---------|------| | | *#*#4636#*#* | | Hardware test (LCD, touch, camera, sensors, etc.) | *#899# | | IMEI number (for network unlocking/identification) | *#06# | | Engineering mode (advanced network/hardware) | *#*#3646633#*#* | | Backup & reset menu | *#*#7780#*#* | | Factory reset (⚠️ wipes all data) | *#*#7378423#*#* (rarely works on Oppo — use Settings instead) | | Firmware version | *#1234# | | Battery status & health | *#*#0228#*#* (Samsung legacy — may not work) → use *#899# instead | how to use secret codes on oppo a9 2020 upd
The remains a versatile device for many users, even after its permanent discontinuation . Understanding its hidden "secret codes" (also known as MMI or USSD codes) can help you troubleshoot hardware issues, check software versions, or perform diagnostic tests without needing external tools. How to Use Secret Codes on OPPO A9 2020 – Manual Hardware Test : An alternative engineering
Now go ahead—open your dialer and explore the hidden layers of your OPPO A9 2020. Just be careful, and never change what you don't understand. How to Use Secret Codes on OPPO A9