How To Use Secret Codes On Oppo A9 2020 Upd

On many updated Oppo phones, *#*#3646633#*#* (Engineer Mode) no longer works due to MediaTek restrictions in ColorOS 11+. You may need third-party apps like MTK Engineering Mode (requires root or ADB).

If your touch response feels erratic, open the Engineer Mode panel ( *#899# ), navigate to manual tests, and pick . You can draw over a pixel grid to identify dead zones across the 6.5-inch panel. Select LCD Display Test to verify that your panel does not have bleeding or stuck pixels. Proximity and Ambient Light Issues

These secret codes give you access to deep system functions. While many are harmless information displays, some can make irreversible changes. Follow these guidelines to protect your device: how to use secret codes on oppo a9 2020 upd

I can provide specific troubleshooting steps based on your phone's status. Share public link

| 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 | On many updated Oppo phones, *#*#3646633#*#* (Engineer Mode)

)—that you enter into your phone's dialer application. They interact directly with the device's firmware and operating system to:

🛠️ Step-by-Step Guide: Entering and Using Engineer Mode 1. Launching the Diagnostics Menu You can draw over a pixel grid to

Displays localized Specific Absorption Rate radiation values. *#*#4636#*#*

Secret codes are specific combinations of numbers and symbols—usually starting or ending with an asterisk (*) or hash (

Displays information about stored calendar events. How to Use the "AfterSales" Testing Menu ( *#899# )