How To Use | Secret Codes On Oppo A9 2020 Upd

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 Here’s a clear, helpful, and safe guide on

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.

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 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: Force Check for OTA Update Code: *#*#682#*#* This

*#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 , 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 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.

How to Enter a Code

1. Open the Phone dialer app.
2. Type the code exactly as shown (including * and #).
3. Most codes execute automatically – you don’t need to press call.
4. For codes that don’t auto-run (like *#800#), press the call button after typing.

4. Proximity & Light Sensor Calibration

Code: *#*#6484#*#* or *#*#64663#*#*

If your screen doesn't turn off during calls, run this code.

• Select "Proximity Sensor Test".
• Cover the top earpiece with your hand. The value should change from "far" to "near".
• If not, tap "Calibration".

Common Oppo/Android secret codes (may vary by firmware)

• ##4636## — Battery, usage, and Wi‑Fi info (may not work on ColorOS).
• *#06# — Display IMEI.
• ##7780## — Factory data reset (confirm prompts; may erase data).
• 27673855# — Full factory reset and reinstall firmware (dangerous — use only if you know what you’re doing).
• ##34971539## — Camera firmware info.
• ##273282255663282*## — Backup media files.
• ##232338## — Wi‑Fi MAC address.
• ##1472365## — Quick GPS test.
• ##8255## — GTalk service monitor.

Note: Many codes depend on ColorOS version; some codes are disabled by manufacturers or carriers.