How To Use Secret Codes On Oppo A9 2020 Upd [new] -

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.

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.

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.

*#07# (SAR Level): Displays the Specific Absorption Rate (SAR) to check the radiofrequency energy level emitted by the device. how to use secret codes on oppo a9 2020 upd

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

How to Use Secret Codes on Oppo A9 2020 (Updated)

Secret codes can give you quick access to device info, test menus, and hidden settings. However, many codes have been restricted in recent ColorOS updates for security reasons. Below is what works reliably on the latest software version.

Part 4: What to Do When a Secret Code Doesn't Work on OPPO A9 2020?

After a major update (e.g., ColorOS 6 to 11), OPPO may disable certain codes for security. If a code fails:

1. Add a trailing star or hash: Some codes require *# at the end, e.g., *#899#*#.
2. Use an alternate dialer: Download "MTK Engineer Mode" app from Play Store (requires no root for basic tests).
3. Check for carrier restrictions: Codes like *#*#4636#*#* are often blocked by Verizon or Jio. Use offline mode.
4. Factory reset (last resort): Rarely, corrupt system UI files break MMI interpretation. Reset from Settings → Additional Settings → Backup & Reset.

5. What if the codes don't work?

OPPO uses a custom skin called ColorOS. In newer updates (ColorOS 7, 11, or 12), OPPO has disabled many generic Android codes for security reasons.

• Alternative for Testing: If codes like *#0*# do not work, go to Settings > About Device > Diagnostics. This built-in tool allows you to test the display, camera, and sensors safely.
• Call Button: Some codes do not auto-trigger. You must type the code and manually press the green "Call" button for them to execute.

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

enter specific strings of characters into the device's pre-installed

. These codes provide access to hidden diagnostic menus, hardware information, and system tests that are not available in the standard settings. Essential Secret Codes for OPPO A9 2020

The following codes are verified for diagnostic and informational purposes: (IMEI Information):

Displays your device's unique International Mobile Equipment Identity (IMEI) number, necessary for tracking or registering your phone. (Software Version):

Provides detailed information about your ColorOS version, Android version, kernel, and build number. (Engineer Mode):

Opens a comprehensive manual hardware test menu to check your screen, sensors, cameras, and more. (Feedback/Log Tool):

A specialized menu for reporting bugs, submitting logs to OPPO, or diagnosing GPS and lag issues. (SAR Level):

Shows the Specific Absorption Rate (SAR) level, indicating the amount of radio frequency energy absorbed by your body. (Hardware Revision):

Displays the PCB (mainboard) serial number and hardware version of your specific unit. *#*#4636#*#* (Phone Info):

Offers detailed battery statistics, Wi-Fi configuration details, and usage statistics. How to Enter the Codes app on your home screen. Type the code exactly as shown (starting with and ending with In most cases, the hidden menu will appear immediately after you type the final . If it does not, tap the green button to execute it. Safe Usage Tips How to Use Secret Codes on OPPO A80 - Hidden Menu

To use secret codes on the OPPO A9 2020 app, navigate to the dialer, and type the specific code as if you were making a call

. Most codes will execute automatically without needing to press the call button. Essential Secret Codes for OPPO A9 2020

Below is a list of the most useful diagnostic and informational codes for this specific model: Displays your device's unique identification numbers. Engineer Mode To use secret codes on your OPPO A9

Opens a hidden diagnostic menu for manual hardware tests (screen, camera, sensors). Software Info

Shows detailed software parameters including ColorOS version, kernel, and build time. Feedback Menu

Used to report logs for issues like lag, GPS problems, or battery drain. Hardware Revision

Displays the mainboard (PCB) serial number and hardware version.

Shows the Specific Absorption Rate for radiation safety standards. *#*#4636#*#* Usage Statistics

Provides advanced information about the battery, Wi-Fi status, and app usage. *#*#225#*#* Calendar Info

Displays events saved in your calendar and upcoming holidays. Advanced Hidden Menus

Beyond dialing codes, you can unlock additional capabilities through the system settings: Codes for OPPO A9 2020 - HardReset.info

How to Use Secret Codes on Oppo A9 2020: A Step-by-Step Guide

The Oppo A9 2020 is a popular smartphone that offers a range of exciting features and functionalities. However, like many other Android devices, it also comes with a set of secret codes that can be used to access hidden menus, test hardware, and perform various troubleshooting tasks. In this essay, we will provide a detailed guide on how to use secret codes on Oppo A9 2020, updated for the latest software versions.

What are Secret Codes?

Secret codes, also known as dialer codes or engineering codes, are special sequences of numbers and symbols that can be entered into the phone's dialer to access hidden features and menus. These codes are usually not documented in the user manual or online resources, but they can be useful for advanced users, developers, and technicians.

Precautions

Before we dive into the list of secret codes, it's essential to note that some of these codes may require technical expertise and can potentially harm your device if not used correctly. Therefore, please exercise caution and use these codes at your own risk. Also, make sure to back up your data before experimenting with secret codes.

How to Enter Secret Codes on Oppo A9 2020

To enter secret codes on Oppo A9 2020, follow these steps:

1. Open the Phone app on your Oppo A9 2020.
2. Switch to the dialer tab.
3. Enter the secret code using the keypad.
4. Press the Call button or the Enter key to execute the code.

List of Secret Codes for Oppo A9 2020

Here are some secret codes that you can try on your Oppo A9 2020:

1. *#06#: This code displays the IMEI (International Mobile Equipment Identity) number of your device.
2. #0#: This code enters the Oppo A9 2020's test menu, where you can test various hardware components such as the display, camera, and sensors.
3. *#1234#: This code displays information about your device's software and hardware, including the Android version, kernel version, and build number.
4. *#6776#: This code enters the Oppo A9 2020's factory mode, where you can perform various tests and calibrations.
5. *#888#: This code enables or disables the Oppo A9 2020's demo mode, which is useful for retail demonstrations.
6. *#899#: This code enters the Oppo A9 2020's engineering mode, where you can configure various settings and perform tests.

Using Secret Codes to Troubleshoot Issues

Secret codes can be useful for troubleshooting common issues on your Oppo A9 2020. For example:

• Camera test: Use the #0# code to test your device's camera and ensure it's functioning correctly.
• Display test: Use the #0# code to test your device's display and detect any issues with the screen.
• Sensor test: Use the #0# code to test your device's sensors, including the accelerometer, gyroscope, and proximity sensor.

Using Secret Codes to Access Hidden Features

Some secret codes can unlock hidden features on your Oppo A9 2020. For example: Add a trailing star or hash: Some codes

• Demo mode: Use the *#888# code to enable demo mode, which allows you to customize your device's home screen and lock screen.
• Engineering mode: Use the *#899# code to access engineering mode, where you can configure advanced settings and perform tests.

Conclusion

Secret codes can be a powerful tool for advanced users and technicians to troubleshoot issues, access hidden features, and perform various tests on their Oppo A9 2020. However, it's essential to use these codes with caution and at your own risk. By following the steps outlined in this essay, you can unlock the full potential of your Oppo A9 2020 and explore its hidden features.

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

How to Use Secret Codes on Oppo A9 2020: A Step-by-Step Guide

The Oppo A9 2020 is a powerful smartphone that offers a range of exciting features and functionalities. However, did you know that you can unlock even more features and access hidden settings using secret codes? In this article, we'll show you how to use secret codes on your Oppo A9 2020, updated for the latest software versions.

What are Secret Codes?

Secret codes, also known as dialer codes or engineering codes, are special codes that allow you to access hidden settings and features on your smartphone. These codes are usually entered into the dialer app, and they can provide you with valuable information about your device, as well as allow you to tweak advanced settings.

How to Use Secret Codes on Oppo A9 2020

To use secret codes on your Oppo A9 2020, follow these steps:

1. Open the Dialer App: Go to your phone's home screen and find the dialer app. Tap on it to open it.
2. Enter the Secret Code: Type in the secret code using the keypad. Make sure to enter it correctly, as incorrect entries may not work.
3. Press the Call Button: Once you've entered the code, press the call button to activate it.

Popular Secret Codes for Oppo A9 2020

Here are some popular secret codes for Oppo A9 2020:

1. *#8080#: This code allows you to access the Oppo A9 2020's testing menu, where you can test various features like the camera, speaker, and more.
2. *#9010#: This code enables you to access the phone's engineering mode, where you can tweak settings like the phone's frequency, signal strength, and more.
3. *#8375#: This code takes you to the Oppo A9 2020's hardware testing menu, where you can test hardware components like the battery, GPS, and more.
4. *#4666#: This code allows you to access the phone's diagnostic menu, where you can view detailed information about your device's hardware and software.

Example Use Cases

Here are some examples of how you can use these secret codes:

• Testing your phone's camera: Use the *#8080# code to access the testing menu, then select the camera option to test your phone's camera features.
• Tweaking your phone's performance: Use the *#9010# code to access the engineering mode, then adjust settings like the phone's frequency and signal strength to optimize performance.
• Troubleshooting issues: Use the *#8375# code to access the hardware testing menu, then test hardware components like the battery and GPS to diagnose issues.

Important Notes

• Be careful when using secret codes: Some secret codes can potentially harm your device or void your warranty. Use them at your own risk.
• Codes may not work on all software versions: Secret codes may not work on all software versions or variants of the Oppo A9 2020.
• Oppo may patch codes in future updates: Oppo may patch or remove secret codes in future software updates, so keep an eye on updates and adjust your usage accordingly.

Conclusion

Using secret codes on your Oppo A9 2020 can unlock new features and provide you with valuable information about your device. However, be cautious when using these codes, and always use them at your own risk. With this guide, you're now ready to explore the world of secret codes on your Oppo A9 2020. Happy experimenting!

Part 1: What Are Secret Codes and Are They Safe?

Secret codes are numeric strings entered into your phone’s dialer app. They trigger hidden activities within the firmware. For the OPPO A9 2020 (running ColorOS 6 to 11), most codes are used by service centers to diagnose issues.

Are they safe? Yes—when used for reading or testing. Avoid tapping "Write" or "Calibrate" in unknown menus.

Alternative for Advanced Users (If Codes Fail)

Since ColorOS 11+ blocks many codes:

1. Use ADB commands (requires PC) to launch hidden activities.
2. Install Activity Launcher from Play Store – search for “com.oppo.engineermode” or “com.mediatek.engineermode”.
3. Check for “Oppo Logkit” via *#800# (works on many updated devices).

What to Do If a Code Doesn’t Work

1. Restart your phone – Some codes are disabled until a fresh boot.
2. Check for update restrictions – ColorOS 12+ blocks some engineering codes for security.
3. Use an alternative – Download “Secret Codes” or “Shortcut Master” from Play Store to launch hidden activities without codes.
4. Enable Developer Options (optional but helps some codes):
   • Go to Settings → About Phone → Version → Tap “Build Number” 7 times.
   • Then go to Settings → Additional Settings → Developer Options.
   • Look for “Launch via USB” or “OEM Unlocking” (not needed for basic codes).

Display Current Update Log

Code: *#*#564548#*#* (translates to ##5(OTA)##) Opens the hidden OTA update log. You can see when the last update was attempted, error codes, and download URLs.

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.