The process is simple and works exactly like making a phone call:
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
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.
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, open the Phone (Dialer) app and type the code exactly as listed; most codes will execute automatically without needing to press the call button. Essential Diagnostic & Information Codes how to use secret codes on oppo a9 2020 upd
These codes allow you to check hardware health and system specifications:
*#899# — Full Diagnostic/AfterSales Menu: Opens the built-in hardware test menu to check the touch screen, sensors, GPS, and audio.
*#06# — IMEI Information: Displays your device’s unique IMEI number and barcodes.
*#6776# — Software Version: Shows detailed firmware info, including Android version, ColorOS version, and build time.
*#888# — Hardware Revision: View the PCB (mainboard) serial number and hardware version.
*#07# — Maximum SAR Level: Displays the specific absorption rate (radiation level) for your device. Advanced Testing & Feedback
*#800# — Feedback/Engineer Menu: Access the feedback menu to report issues like lag, GPS problems, or camera bugs directly to Oppo.
*#*#4636#*#* — Phone Info: Provides real-time data on battery health, usage statistics, and Wi-Fi signal strength.
*#*#426#*#* — FCM Diagnostics: View connection events and debug information for Google Play Services.
*#*#225#*#* — Calendar Events: Quickly view all events saved in your device's connected calendars. Security & Troubleshooting How to Use Secret Codes on OPPO Reno 13 Pro
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
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#*#* The process is simple and works exactly like
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.
These codes will delete data. Do not use these unless you intend to wipe your device.
A. Factory Data Reset
B. Hard Reset (Recovery Mode Alternative)
Code: *#*#6484#*#* or *#*#64663#*#*
If your screen doesn't turn off during calls, run this code.
Would you like a version formatted as a video script, Instagram carousel, or blog post?
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 (
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 These codes are generally used for checking hardware
(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 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
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
Code: *#*#682#*#*
This forces the phone to ping the OPPO update server immediately. It’s more aggressive than tapping "Check for Updates" in Settings.
Code: *#06#
The universal IMEI code. This displays your device’s unique 15-digit IMEI numbers (two for dual SIM) and serial number. Copy this for carrier registration or warranty claims.
Code: *#888#
Displays the PCB (Printed Circuit Board) serial number and hardware version.
Code: *#6776#
Shows the Build Time, kernel version, and ColorOS detailed version. Useful to verify if an update was successful.