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How To Use Secret Codes On Oppo A9 2020 Upd Link

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

(updated for April 2026), open your phone’s default Dialer/Phone app and type the specific numeric string exactly as shown. Most codes will execute automatically as soon as you press the last character (usually #) without needing to press the call button. Essential Diagnostic Codes

These codes allow you to check hardware health and system information:

*#899# – Engineer Mode / AfterSale Page: The primary diagnostic menu used by technicians to test the screen, audio, camera, and sensors.

*#06# – IMEI Check: Displays your device’s unique international mobile equipment identity, which is essential for warranty or lost-phone tracking.

*#6776# – Software Info: Detailed view of your Android version, ColorOS build, kernel, and branch details.

*#888# – Hardware Revision: Displays your PCB (mainboard) serial number and hardware version.

*#07# – SAR Level: Shows the Specific Absorption Rate (radiation level) for your device. Advanced Testing & Network Codes

Use these for deeper system insights or troubleshooting connection issues:

*#800# – Feedback Menu: Used to log system performance or report bugs like GPS lag directly to OPPO.

*#*#4636#*#* – Phone Stats: Shows detailed information about battery health, usage statistics, and Wi-Fi/network signal strength.

*#36446337# – Manual Hardware Test: An alternative engineering menu for specific manual component tests. how to use secret codes on oppo a9 2020 upd

*#*#426#*#* – FCM Diagnostics: Provides information on Google Play Services connection events.

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

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

, you must enter specific numerical strings into the stock Phone (Dialer) app. These codes allow you to access hidden diagnostic menus, check hardware health, and view advanced software information that is not visible in standard settings. How to Use Secret Codes Open the Phone app on your Oppo A9 2020 Navigate to the dial pad. Type the desired code starting with * or #.

Note: Most codes execute automatically once the last character is typed; you generally do not need to press the "Call" button. Essential Secret Codes for Oppo A9 2020 Secret Code Function / Purpose Diagnostic Test *#899#

Opens the Engineer Mode (or After-Sale Page) to test hardware like the screen, sensors, and cameras. Software Info *#6776#

Displays detailed firmware info, including Android version, ColorOS version, and kernel details. Device ID *#06#

Instantly shows your phone's IMEI number, which is critical for tracking or unlocking. Hardware Version *#888#

Shows the hardware revision and PCB (mainboard) serial number. SAR Level *#07#

Displays the Specific Absorption Rate (radiation level) for safety verification. Feedback Menu *#800#

Accesses the built-in feedback and log menu to report issues directly to Oppo. Universal Info *#*#4636#*#* To use secret codes on your OPPO A9

Provides deep usage statistics, battery health info, and Wi-Fi/Network details. Advanced Testing and Debugging

For more technical troubleshooting, you can use these deeper diagnostic codes: Codes for OPPO A9 2020 - HardReset.info

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:

*#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. Important Notes for Oppo A9 2020 Users

*#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

Here’s a helpful, user-friendly content piece on using secret codes on the Oppo A9 2020 (running ColorOS, typically based on Android 9–11).

Note: These codes work only if the device software hasn’t been heavily modified by carriers or updated to newer ColorOS versions that restrict them.

Important Notes for Oppo A9 2020 Users

1. How to Enter Secret Codes

The process is simple and works exactly like making a phone call:

  1. Open the Phone (Dialer) app on your OPPO A9 2020.
  2. Type the code exactly as shown (including the asterisks * and hashes #).
  3. If the code is valid, the phone will either:
    • Automatically open a hidden menu.
    • Show a "MMI Code Started" message followed by a result.
    • Prompt you to press the green "Call" button.

Part 3: Working Secret Codes for OPPO A9 2020 (Updated List)

Here are the most reliable codes tested on the OPPO A9 2020 with CPH1937, CPH1939, and CPH1941 models.

7. Camera Module Test (Samsung/GK)

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.

Update Firmware via SD Card (Engineer Use)

Code: *#*#1029#*#* Allows you to apply a local OZIP or ZIP update file if you have downloaded the full ROM from OPPO’s support site. Do not use random files from the internet.

Force Check for OTA Update

Code: *#*#682#*#* This forces the phone to ping the OPPO update server immediately. It’s more aggressive than tapping "Check for Updates" in Settings.