How To Use Secret Codes On Oppo A9 2020 Upd

: Quickly checks your phone's PCB (mainboard) serial number and hardware revision level.

Provides the PCB (mainboard) serial number and hardware version.

Ultimate Guide: How to Use Secret Codes on Oppo A9 2020 (Updated) how to use secret codes on oppo a9 2020 upd

Engineer Mode is the most valuable hidden menu on any Oppo phone. It contains comprehensive hardware tests and diagnostics used by professionals to check components before and after repairs. It runs from a hidden app ( com.oppo.engineermode ) that ships on every Oppo device.

Choose to test individual components (e.g., check camera quality, test if the gyro sensor is working, or test touch accuracy). : Quickly checks your phone's PCB (mainboard) serial

Reveals specific Android versions, kernel data, and the current ColorOS build version. Hardware Revision & PCB Serial Number

The , even years after its release, remains a popular mid-range device, particularly when updated with the latest available ColorOS versions as of 2026. While the user interface is intuitive, hidden deep within the system are secret codes (often called USSD codes or MMI codes ) that allow advanced users to access diagnostic tools, test hardware, and change settings not found in the standard menus. Reveals specific Android versions, kernel data, and the

: Accesses the engineering menu for advanced settings, often used to report bugs or check system logs.

Here is an updated list of codes designed to work on the OPPO A9 2020 running ColorOS (Android). 1. General Information and Diagnostics

– 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

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