How To Use — Secret Codes On Oppo A9 2020 Upd

Opens a feedback menu where you can report issues like GPS lag or system bugs directly to OPPO. Quick Setup Guide Open Dialer : Access the Phone app on your home screen. Enter Code : Carefully type one of the codes above.

enter specific strings of characters into the device's pre-installed

: Displays your device's unique IMEI number , which is essential for identifying the phone or tracking it if lost.

This is the most critical code for troubleshooting. If your camera, sensors, screen, or microphone is acting up, open the dialer, type *#899# , and select "Manual Test." You can test: (screen goes black during calls) Gyroscope and Accelerometer Camera focus and flash 2. The EngineerMode App how to use secret codes on oppo a9 2020 upd

| 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. |

Monitors push notification delivery pathways and active server connection status. Specific Absorption Rate (SAR) Level

Using these codes will erase all data on your device, including apps, photos, and messages. Opens a feedback menu where you can report

: Do not change parameters in Engineer Mode unless you are a trained technician, as it can affect network connectivity or sensor calibration.

*#808# - Opens the manual hardware test interface.

Displays your device's unique International Mobile Equipment Identity (IMEI) number, necessary for tracking or registering your phone. (Software Version): enter specific strings of characters into the device's

: Displays the PCB (mainboard) version and hardware status. *#*#4636#*#*

– Google Play Services: Opens debug information for FCM (Firebase Cloud Messaging). *#*#0289#*#* – Audio Test: Tests the phone's speakers. *#*#0842#*#* – Vibration Test: Tests the vibration motor. Important Safety Notes and Risks

While secret codes can be useful, it's essential to use them with caution. Here are some precautions to keep in mind:

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