Oppo A9 2020 Upd | How To Use Secret Codes On

How to Use Secret Codes on Oppo A9 2020: A Comprehensive Guide

The Oppo A9 2020 is a popular smartphone that offers a range of features and functionalities. While it may seem like a straightforward device to use, there are several secret codes that can unlock hidden features and provide users with more control over their device. In this article, we will explore how to use secret codes on Oppo A9 2020 and update your knowledge on the latest codes available.

What are Secret Codes?

Secret codes, also known as dialer codes or USSD codes, are a series of numbers and symbols that can be entered into the dialer app on your smartphone to access hidden features, test device hardware, and configure settings. These codes are not well-known and are not typically documented in user manuals or online resources. However, they can be incredibly useful for troubleshooting issues, optimizing device performance, and unlocking advanced features.

How to Use Secret Codes on Oppo A9 2020

Using secret codes on Oppo A9 2020 is a relatively straightforward process. Here's how to do it:

Open the Dialer App: Locate the dialer app on your Oppo A9 2020 and tap on it to open it.
Enter the Code: Type in the secret code you want to use. Make sure to enter it correctly, as incorrect entries may not work or may even cause issues with your device.
Press the Call Button: Press the call button to execute the code.

Secret Codes for Oppo A9 2020

Here are some of the most useful secret codes for Oppo A9 2020:

*#808#: This code will test the device's hardware, including the touchscreen, audio, and vibration.
*#0000#: This code will display information about your device, including the model number, firmware version, and hardware specifications.
*#06#: This code will display your device's IMEI (International Mobile Equipment Identity) number.
*#7465625#: This code will display your device's firmware version and security patch level.
*#7780#: This code will perform a factory reset on your device. Be careful when using this code, as it will erase all data on your device.

New Secret Codes for Oppo A9 2020 (Updated)

Here are some new secret codes for Oppo A9 2020 that have been recently discovered:

##4636##**: This code will display information about your device's battery, including the battery level, temperature, and health.
##2663##**: This code will test the device's touchscreen and display calibration.
##3264##**: This code will display information about your device's RAM and storage.

Tips and Tricks

Here are some tips and tricks to keep in mind when using secret codes on Oppo A9 2020:

Be Careful: Some secret codes can cause issues with your device or erase data. Make sure to use them with caution and at your own risk.
Test Your Device: Use secret codes to test your device's hardware and software to identify any issues or problems.
Update Your Knowledge: Keep an eye out for new secret codes and updates, as they can provide access to new features and functionalities.

Common Issues and Solutions

Here are some common issues that users may encounter when using secret codes on Oppo A9 2020, along with some solutions:

Code Not Working: If a code is not working, make sure to enter it correctly and check that your device is compatible with the code.
Device Not Responding: If your device is not responding after entering a code, restart your device and try again.
Data Loss: If you experience data loss after using a secret code, make sure to back up your data regularly and use caution when using codes that can erase data.

Conclusion

Secret codes can be a powerful tool for Oppo A9 2020 users, providing access to hidden features, testing device hardware, and optimizing performance. By following the steps outlined in this article and being aware of the latest codes available, users can unlock the full potential of their device and take their smartphone experience to the next level.

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 use secret codes on oppo a9 2020 upd

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

The OPPO A9 2020 Go to product viewer dialog for this item. 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

Using these codes is straightforward and does not require an internet connection. Open the Phone/Dialer app from your home screen.

Type the specific code exactly as written (e.g., *#06#) into the keypad.

In most cases, the menu or information will appear automatically after you type the last character. If nothing happens, press the Call button to execute the command. Essential Secret Codes List Below is a curated list of frequently used codes for the OPPO A9 2020

IMEI Number Check (*#06#): Displays your device’s unique international mobile equipment identity, essential for warranty claims or reporting a lost phone.

Hardware Version Check (*#888#): Use this to view the PCB (mainboard) serial number and hardware revision of your device.

Complete Software Information (*#6776#): Provides deep details including Android version, kernel version, ColorOS version, and build branch.

Engineering/Diagnostic Mode (*#899# or *#800#): Opens a technician-level menu for testing hardware components like the screen, cameras, vibration, and sensors.

Phone and Battery Information (*#*#4636#*#*): Accesses detailed usage statistics, battery status, and Wi-Fi configuration.

SAR Level Check (*#07#): Displays the Specific Absorption Rate (radiation level) for your specific model. Specific Hardware Diagnostic Codes

If you suspect a specific part of your phone is failing, you can trigger individual tests: Codes for OPPO A9 2020 - HardReset.info

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

, you simply need to enter them into your phone's Dialer (Phone) app as if you were making a call. These codes, often called USSD or MMI codes, automatically trigger hidden menus or information screens as soon as you finish typing the last character. Essential Secret Codes for OPPO A9 2020 *#06#

IMEI Information: Displays your device's unique identification numbers. *#899#

Engineer Mode (Diagnostic): Opens the factory test menu to check hardware like the screen, touch, and audio. *#6776#

Software Version: Shows deep details like Android version, Kernel, and ColorOS build. *#800#

Feedback Menu: Accesses logs and provides a platform to report bugs or issues to OPPO. *#888# How to Use Secret Codes on Oppo A9

Hardware Revision: Displays the PCB (mainboard) version and hardware status. *#*#4636#*#*

Testing Menu: Provides detailed battery statistics, network information, and usage history. Advanced & Utility Codes

*#07#: Displays the Maximum SAR Level (Specific Absorption Rate) for your device.

*#*#426#*#*: Opens FCM Diagnostics to view Google Play Services and Firebase connection events.

*#*#225#*#*: Shows information about your Calendar storage and upcoming events.

*#813#: Used on some updated models as a shortcut to bypass setup screens (use with caution). Important Usage Tips

Handle with Care: Some codes, particularly those related to "Factory Reset" (like *#8778#), may erase your data immediately without a confirmation prompt.

Compatibility: Certain codes may stop working after major ColorOS updates or if they are specific to certain carriers.

Developer Options: If codes are not enough, you can unlock more settings by going to Settings > About Phone and tapping Build Number seven times.

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#*#* Open the Dialer App : Locate the dialer

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.

(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.

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

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

✅ Important Note Before You Start

These codes do not require root access.

Some codes may not work after major updates (e.g., ColorOS 12) if Oppo restricts them for security reasons.

Do not change settings unless you understand them — you could affect your network or sensors.

Part 6: Pro Tips for Using Secret Codes on OPPO A9 2020

No root required: All codes above work on stock, unrooted devices.

Take screenshots: Before altering any value, screenshot the original settings.

Don't use call button: Most codes launch instantly. If you press dial, it may try to call a number instead.

Log your tests: Use *#899# → "Run Log" to save test results to internal storage for service center visits.

Recover deleted contacts? No secret code can recover deleted data. That’s a myth. Use Google Photos or OPPO Cloud.

3. Advanced Audio & Motor Tests

Code: *#*#3646633#*#*

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

Use cases: Test speaker loudness, earpiece volume, microphone recording levels, and vibration motor strength.

Navigating: Tap "Hardware Testing" → "Audio" → "Normal Mode" to adjust volumes (only for personal use, not for debugging).

Useful Secret Codes for Oppo A9 2020

| 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). |

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.

How to Enter a Code

Open the Phone dialer app.

Type the code exactly as shown (including * and #).

Most codes execute automatically – you don’t need to press call.

For codes that don’t auto-run (like *#800#), press the call button after typing.