How To Use Secret Codes On Oppo A9 2020 Upd -

These codes allow you to access hidden diagnostic menus and critical device information:

Engineer/Diagnostic Mode (*#899#): This is the most vital code for hardware troubleshooting. It opens a menu to test the touchscreen, display, audio, sensors, and camera.

Phone Information (*#*#4636#*#*): Displays detailed network and battery statistics, usage history, and Wi-Fi information.

Software Information (*#6776#): Shows your ColorOS version, Android version, kernel version, and other software parameters.

IMEI Number (*#06#): Instantly displays your device's unique identification numbers.

Hardware Revision (*#888#): Provides the PCB (mainboard) serial number and hardware version.

Feedback & Logs (*#800#): Opens a feedback menu where you can report issues like GPS lag or system bugs directly to OPPO. Quick Setup Guide Open Dialer: Access the Phone app on your home screen. Enter Code: Carefully type one of the codes above.

Automatic Launch: The hidden menu should appear immediately. If it doesn't, try pressing the Call button. | Code | Function | |------|-----------| | *#06#

Caution: Be careful with "Factory Reset" codes like *#8778#, as they may instantly delete your data without a second warning. Activating Developer Options If you need deeper system tweaks beyond secret codes: Go to Settings > About Phone > Version.

Tap Build Number 7 times until you see "You are now a developer".

The new menu will appear under Settings > Additional Settings > Developer Options.

Disclaimer: These codes are intended for advanced users and developers. Some codes can reset your device, delete data, or change critical system settings. Proceed at your own risk. It is highly recommended to back up your data before experimenting with unknown codes.

Code: *#8778#

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.

Secret codes (often called USSD codes or MMI codes) are special sequences of characters that you type into your phone’s dialer to access hidden menus, diagnostic tools, and testing modes.

Code: *#*#3646633#*#*

This is the MediaTek Engineer Mode (the OPPO A9 2020 is powered by MediaTek Helio P70).

Using secret codes on your OPPO A9 2020 gives you diagnostic power usually reserved for repair technicians. Whether you need to test a faulty proximity sensor, check real battery voltage, force an OTA update, or retrieve your IMEI, these codes save time and effort.

Most valuable code: *#899# – Remember it, bookmark it, use it monthly to monitor your phone's health.

Updated for 2025-2026: All codes verified on ColorOS 11 (Android 10/11) with security patches up to December 2025. If a future update disables any code, use the MTK Engineer Mode app as a backup.

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.

Have a secret code that works on your OPPO A9 2020 not listed here? Share it in the comments below!

To use secret codes on your OPPO A9 2020 Go to product viewer dialog for this item.

, simply open your Phone (Dialer) app and type the code exactly as shown below. Most of these codes will execute automatically as soon as you type the final character (usually a # or *), so you typically do not need to press the call button. Common OPPO A9 2020 Secret Codes

These codes allow you to check hardware, software, and diagnostic information directly: After a major update, Oppo often moves or hides functions

*#06# (IMEI Info): Displays your device's unique IMEI number, which is essential for identifying the phone or tracking it if lost.

*#899# (Diagnostic Test Menu): Opens the built-in After-Sales Space (or Manual Test menu) where you can run full hardware tests on the screen, cameras, vibration, and sensors.

*#6776# (Software Version): Shows detailed software parameters including the Android version, ColorOS version, and kernel information.

*#800# (Engineer Mode/Feedback): Accesses the engineering menu for advanced settings, often used to report bugs or check system logs.

*#888# (Hardware Revision): Quickly checks your phone's PCB (mainboard) serial number and hardware revision level.

*#*#4636#*#* (Testing Menu): Provides hidden statistics for your Wi-Fi, Network, and Battery usage.

*#07# (SAR Level): Displays the Specific Absorption Rate (SAR) to check the radiofrequency energy level emitted by the device.

Highlight Feature: 5000mAh Ultra Battery with Reverse Charging One of the standout features of the OPPO A9 2020

is its massive 5000mAh battery, which is designed for longevity and utility.

All-Day Endurance: The high capacity allows for over 11 hours of continuous HD video playback.

Reverse Charging: This feature turns your phone into a portable power bank. By using an OTG (On-The-Go) cable, you can reverse charge other devices like a friend's phone or your wireless earbuds.

Intelligent Optimization: Combined with the Snapdragon 665 processor, the device manages power consumption efficiently, extending usage for gamers and power users. Codes for OPPO A9 2020 - HardReset.info

To use secret codes on your OPPO A9 2020 , you simply enter them directly into the phone's keypad as if you were making a call

. These codes, often called USSD or MMI codes, provide access to hidden menus for hardware testing, software information, and system diagnostics. How to Enter Codes (dialer) app. Tap on the Carefully type the code (e.g.,

Most codes will execute automatically as soon as the last character is entered. If they don't, tap the Essential Secret Codes for OPPO A9 2020

How to Run a Full Diagnostic Test on an Oppo Smartphone: All Methods