Secret codes (USSD or MMI codes) can quickly launch hidden tests, device info, and service menus. On the Oppo A9 2020, here’s how to use them.
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.
Code: *#*#3646633#*#*
This is the MediaTek Engineer Mode (the OPPO A9 2020 is powered by MediaTek Helio P70).
Open the default Phone app (the green dialer icon). Do not use Google Dialer if you changed defaults.
After a major update, Oppo often moves or hides functions. The most reliable “secret menu” is still *#899#. Bookmark it — it’s safe, shows battery health, touch accuracy, camera test, and storage info without risk.
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:
List of Secret Codes for Oppo A9 2020
Here are some secret codes that you can try on your Oppo A9 2020:
Using Secret Codes to Troubleshoot Issues
Secret codes can be useful for troubleshooting common issues on your Oppo A9 2020. For example: how to use secret codes on oppo a9 2020 upd
Using Secret Codes to Access Hidden Features
Some secret codes can unlock hidden features on your Oppo A9 2020. For example:
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 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.
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. Secret codes (USSD or MMI codes) can quickly
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 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#
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. List of Secret Codes for Oppo A9 2020
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
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.
These codes are generally used for checking hardware status and viewing information.
A. Engineering Mode (MTK Devices) Since the OPPO A9 2020 runs on a MediaTek (Snapdragon 665) processor, this is the most powerful code for accessing hardware tests (sound, screen, sensors, etc.).
B. General Test Mode
C. IMEI Number Check
D. RAM & Memory Info