On Oppo A9 2020 Upd | How To Use Secret Codes
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.
Changing how your phone connects to cellular towers.
If you want a particular hidden function (e.g., reset, view IMEI, test sensors), tell me which one and I’ll give the exact code and precautions.
This is the most vital code for hardware troubleshooting. It opens a menu to test the touchscreen, display, audio, sensors, and camera. how to use secret codes on oppo a9 2020 upd
If a test fails, you likely have a hardware issue requiring professional repair. Troubleshooting: Secret Codes Not Working
Secret codes (USSD or MMI codes) can quickly launch hidden tests, device info, and service menus. On the , here’s how to use them.
Watch this step-by-step guide to see these codes in action and learn how to navigate the hidden service menus safely: 02:06 Secret codes can be a powerful tool for
– Software Version: Provides comprehensive details about your phone’s software, including build time and operator version. 2. Network and Connectivity Settings
I've organized the most useful codes into categories based on what they do. In the list below, I've highlighted the codes that are arguably the most useful, so you know where to start.
Used to report logs for issues like lag, GPS problems, or battery drain. Hardware Revision Changing how your phone connects to cellular towers
*#07# — Displays the SAR (Specific Absorption Rate) level of your device. 2. Network and Connectivity
| Function / Menu | Secret Code to Dial | What It Does | | :--- | :--- | :--- | | | | IMEI Info | *#06# | Displays the unique 15-digit IMEI (International Mobile Equipment Identity) number for your phone. This is crucial for reporting a lost or stolen device or when contacting customer support. | | Phone Software Info | *#6776# | Shows a wealth of software details, including your Android version, kernel version, ColorOS version, security patch level, and build number. | | Hardware / PCB Version | *#888# | Reveals the PCB (Printed Circuit Board) serial number and hardware revision. This is primarily for technicians but interesting for any tech enthusiast. | | Firmware & Build Info | *#1234# | Displays your phone's model number (e.g., CPH19xx) and the current firmware build version. | | SAR Level | *#07# | Shows the Specific Absorption Rate (SAR) value, which measures the radio frequency energy absorbed by the body from the phone. | | 🔧 Engineering & Diagnostic Modes | | ⭐ Full EngineerMode / AfterSale | *#899# | Opens the main EngineerMode (often labeled "AfterSale" on newer devices). This is your command center, containing a full suite of tests for your phone's hardware. | | ⭐ Manual Hardware Test | *#808# | Opens a manual hardware test mode where you can individually test the screen, speakers, microphones, sensors, and more. | | Automated Hardware Test | *#807# | Runs an automated diagnostic routine that checks all the major hardware components, providing a quick overview of your phone's health. | | Echo & Mic Test | *#809# | Useful for checking the functionality of your microphones and earpiece for echo issues during calls. | | Feedback Menu | *#800# | Opens a feedback tool where you can report software bugs, issues, or provide suggestions directly to Oppo. | | 📍 Network & Connectivity Tests | | GPS Test | *#802# | Performs a test of your GPS receiver to check its accuracy and how quickly it can get a satellite lock. | | Wi-Fi Settings | *#803# | Opens a menu for testing and configuring Wi-Fi settings. | | Bluetooth Test | *#805# | Initiates a test for your phone's Bluetooth module. | | Google Services Info | *#*#426#*#* | Provides detailed information about the connection and events related to Google Play Services and Firebase Cloud Messaging (FCM). | | ⚙️ Advanced & Miscellaneous | | Android Testing Menu | *#*#4636#*#* | Opens the standard Android testing menu, providing in-depth info on your Phone, Battery, and Wi-Fi usage statistics. | | Calendar Events | *#*#225#*#* | Shows the number of festivities and events stored in your phone's calendar. | | Full Camera Info | *#*#34971539#*#* | Displays extensive technical information about your phone's camera hardware and its firmware. | | USB Settings | *#0808# | Opens a menu to change the USB configuration mode (e.g., MTP, Charging, RNDIS). This is a developer-level tool. | | ⚠️ Danger Zone: Use with EXTREME Caution | | Factory Data Reset | *#*#7780#*#* | This will erase all your phone's data and restore it to factory settings, removing all Google accounts and apps you've installed. Your internal storage (photos, etc.) should remain, but a full backup is still strongly advised. | | Full Hard Reset / Reflash | *2767*3855# | This is a nuclear option. It performs a complete hard reset, wiping all your data and reinstalling the device's firmware. This is a one-way trip that will set your phone back to its "out-of-the-box" state, and it's not something to be taken lightly. |
Ultimate Guide: How to Use Secret Codes on Oppo A9 2020 (Updated)
(updated for April 2026), open your phone’s default 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
Warning: Secret (USSD/engineering) codes can access hidden menus and change system settings. Use caution — some actions may reset your device, erase data, or affect network connectivity. Back up important data first.