– Manual Hardware Test : An alternative engineering menu for specific manual component tests.
It is important to note that the effectiveness of secret codes can vary depending on your phone's software version. The Oppo A9 2020 originally launched with Android 9 Pie with ColorOS 6.1, but many units have since received updates to Android 10 with ColorOS 7.
Are you troubleshooting a (like battery drain or touch issues)?
Using these codes is as easy as making a phone call. Here's how: how to use secret codes on oppo a9 2020 upd
Frequent factory resets can degrade the internal storage over time and cause unnecessary wear on components.
Here are some popular secret codes for Oppo A9 2020:
as the system systematically cycles through screen color fills, vibrator modules, and backlight levels. – Manual Hardware Test : An alternative engineering
Start the tests simultaneously to recalibrate the accelerometer and gyroscope. Safety and Precautionary Guidelines
This code lets you see your phone mainboard serial number. It is helpful if a repair shop needs to replace parts on your device. 5. Check Maximum SAR Level (Radiation) Code: *#07#
The Complete Guide to Oppo A9 2020 Secret Codes (Updated) Oppo smartphones run on ColorOS, a customized version of Android. ColorOS contains hidden diagnostic menus and testing tools. You can access these tools using secret codes, also known as USSD or MMI codes. Are you troubleshooting a (like battery drain or
– Software Info : Detailed view of your Android version, ColorOS build, kernel, and branch details.
Use these codes to verify that specific hardware components are functioning properly. They are invaluable for troubleshooting.
| 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. |
Based on updated data for 2026, here are the most relevant and functional codes for the Oppo A9 2020: 1. Device Information & Diagnostics
for the screen to transition into the "EngineerMode" dashboard automatically. 2. Running an Automatic Diagnostic Test Select "Automatic Test" inside the menu.