How To Use Secret Codes On Oppo A9 2020 Upd Jun 2026

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

. These codes, also known as MMI or USSD codes, trigger hidden diagnostic menus and system information screens that are not accessible through standard settings. How to Enter Codes (Dialer) app on your device. Type the code exactly as written (starting with

Here’s a concise guide on using secret codes (also known as USSD codes or engineering codes) on the , provided your device is running a recent update (ColorOS 11 or later based on Android 10/11). how to use secret codes on oppo a9 2020 upd

: Use this to view the PCB (mainboard) serial number and hardware revision of your device.

Shows detailed software parameters including ColorOS version, kernel, and build time. Feedback Menu : Accesses the engineering menu for advanced settings,

: View the PCB (mainboard) serial number and hardware version.

These codes allow you to check hardware health and system information: How to Enter Codes (Dialer) app on your device

OPPO uses a custom skin called . In newer updates (ColorOS 7, 11, or 12), OPPO has disabled many generic Android codes for security reasons.

Newer updates (e.g., ColorOS 11/12) sometimes patch or change old secret codes.