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

To use secret codes on your OPPO A9 2020 , you simply enter specific number sequences into the pre-installed Phone/Dialer app

. These codes, also known as MMI or USSD codes, trigger hidden diagnostic menus and system information screens that are not accessible through standard settings. How to Enter Codes (Dialer) app on your device. Type the code exactly as written (starting with

Most codes will execute automatically as soon as the last character is typed; if not, press the To exit these hidden menus, use the button or the Home gesture. Essential Secret Codes for OPPO A9 2020 Displays your device IMEI number Diagnostics Engineer Mode for hardware tests (screen, touch, sensors). Shows full software information including Android and ColorOS versions. Checks the PCB (mainboard) serial number and hardware revision. *#*#4636#*#* View detailed Phone Information , Battery stats, and WiFi usage. Launches the Oppo Feedback menu to report logs or GPS/lag issues. Displays the (Specific Absorption Rate) of the device. Accesses System Dump mode to delete junk log files. Specialized & Advanced Functions

Accessing secret codes on your OPPO A9 2020 (CPH1937/CPH1931) allows you to perform hardware diagnostics, check software versions, and view battery health without navigating complex settings. 🛠️ Core Diagnostic Codes *#899#

Full Engineer Mode / After-Sales Tool. Tests LCD, cameras, sensors, and GPS. *#800#

Feedback Menu. Used to report system lags, battery drain, or GPS issues. *#6776#

Software Information. Displays ColorOS version, Android version, and kernel details. *#06#

IMEI Check. Displays your device's unique identification numbers. *#*#4636#*#*

Phone Information. Detailed battery stats, Wi-Fi status, and network usage. 📝 Step-by-Step Guide Open Dialer: Tap the Phone app icon on your home screen. Enter Code: Carefully type the sequence (e.g., *#899#).

Automatic Execution: Most codes on the A9 2020 trigger the menu automatically once the final # is pressed.

Select Test: If using *#899#, choose Manual Test to check specific components like the proximity sensor or vibration motor. 🔍 Key Updated Codes (2024-2026)

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

FCM Diagnostics (*#*#426#*#*): Checks Google Play Services connection events and real-time status.

Calendar Info (*#*#225#*#*): Shows the number of saved events and technical calendar metadata.

SAR Level (*#07#): Displays the specific absorption rate (radiation level) for your device. ⚠️ Important Safety Tips

Avoid Random Codes: Some codes found online can trigger a factory reset (e.g., *#8778#) and erase all your data immediately.

Settings Caution: Do not change parameters in Engineer Mode unless you are a trained technician, as it can affect network connectivity or sensor calibration. how to use secret codes on oppo a9 2020 upd

Exit Normally: Always use the "Back" button or "Exit" option to leave a secret menu rather than forcing a restart.

Note on Developer Options: If you need deeper system access, go to Settings > About Phone and tap Version seven times to enable "Developer Options" under Additional Settings. If you're having a specific issue, tell me:

What problem are you trying to fix? (e.g., screen lag, battery drain, or sensor issues) What ColorOS version are you currently on? I can guide you to the exact test or setting you need. Codes for OPPO A9 2020 - HardReset.info

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#*#*

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

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. To use secret codes on your OPPO A9

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:

Open the Phone app on your Oppo A9 2020.
Switch to the dialer tab.
Enter the secret code using the keypad.
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:

*#06#: This code displays the IMEI (International Mobile Equipment Identity) number of your device.
#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.
*#1234#: This code displays information about your device's software and hardware, including the Android version, kernel version, and build number.
*#6776#: This code enters the Oppo A9 2020's factory mode, where you can perform various tests and calibrations.
*#888#: This code enables or disables the Oppo A9 2020's demo mode, which is useful for retail demonstrations.
*#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:

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 Phone (Dialer) app and type the code exactly as shown

. For most codes, the hidden menu will open automatically once you type the final symbol—you do not need to press the "Call" button. Prizm Institute Essential Secret Codes Secret Code Engineer / Service Mode IMEI Number Full Software Information Hardware Revision (PCB) Maximum SAR Level FCM Diagnostics *#*#426#*#* Calendar Info *#*#225#*#* Feedback/Bug Reporting Specific Hidden Menus Engineer Mode ( Open the Phone app on your Oppo A9 2020

This is the most comprehensive tool for testing hardware. You can perform manual tests on the touchscreen, camera, sensors (like the gyroscope), and speakers. Software Details (

Use this to check your exact ColorOS version, Android version, and kernel details. Network Unlock ( *#3988691#

If your device is region-locked and you have an official unlock code, this dialer code prompts the input field. Prizm Institute Troubleshooting & Advanced Access Unlock Bypass: If you are locked out, you can enter the Emergency Call dialer and use to bypass certain setup screens after a reset. Recovery Mode: If dialer codes aren't enough, turn off your phone and hold Power + Volume Down

simultaneously to enter the Recovery Menu for data wiping or system updates. Developer Options: Settings > About Phone

seven times to enable Developer Mode, which allows for deeper system debugging. specific hardware test

(like checking for dead pixels or sensor calibration) within the Engineer Mode menu? 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

Here’s a clear, helpful, and safe guide on how to use secret codes (also known as USSD codes or engineering codes) on the Oppo A9 2020, especially after a software update (ColorOS 11 or 12 based on Android 10/11).

Step 1: Open the Dialer

Open the Phone app (dialer) as if you’re making a call.

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.

Safer alternatives

Use Settings > About phone for IMEI, software, and status info.
Use official engineering apps (when available) or third‑party diagnostic apps from Play Store for tests (Wi‑Fi, GPS, sensors).

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.

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).

Troubleshooting

Code does nothing → Update may have blocked it. Try restarting phone first.
Opens a blank screen → Code function exists but UI is hidden on ColorOS.
"Connection problem or invalid MMI" → Carrier blocked it, or you need to add # at the end.

Would you like a version formatted as a video script, Instagram carousel, or blog post?

Here’s a concise guide on using secret codes (also known as USSD codes or engineering codes) on the Oppo A9 2020, provided your device is running a recent update (ColorOS 11 or later based on Android 10/11).

6. Bluetooth & Wi-Fi MAC Address

Code: *#*#232338#*#* Shows your Wi-Fi MAC address without going into Settings → About Phone.

Code: *#*#232337#*#* Shows your Bluetooth device address.

9. FTA (Field Test Analysis) Mode

Code: *#*#3649546#*#* Used to enable Full Throughput Analysis for network engineers. It shows signal strength (RSRP, RSRQ) and band info (LTE band 1,3,5, etc.). Useful in areas with poor reception.