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

The process is simple and works exactly like making a phone call:

Code: *#8778#

This code prompts a total factory reset (wipe all data, logs, settings). Unlike the Settings menu, this does not ask for a password if the screen is unlocked. Back up your data before using this.

These are useful for checking connectivity status or call forwarding.

A. Call Forwarding (Divert)

B. Call Waiting

C. Carrier Phone Number

Code: *#*#3646633#*#*

This is the MediaTek Engineer Mode (the OPPO A9 2020 is powered by MediaTek Helio P70).

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.

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Here’s a helpful, user-friendly content piece on using secret codes on the Oppo A9 2020 (running ColorOS, typically based on Android 9–11).

Note: These codes work only if the device software hasn’t been heavily modified by carriers or updated to newer ColorOS versions that restrict them.

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

To use secret codes on your OPPO A9 2020 , you simply enter them directly into the phone's keypad as if you were making a call

. These codes, often called USSD or MMI codes, provide access to hidden menus for hardware testing, software information, and system diagnostics. How to Enter Codes (dialer) app. Tap on the Carefully type the code (e.g., how to use secret codes on oppo a9 2020 upd

Most codes will execute automatically as soon as the last character is entered. If they don't, tap the Essential Secret Codes for OPPO A9 2020

How to Run a Full Diagnostic Test on an Oppo Smartphone: All Methods

Open the default Phone app (the green dialer icon). Do not use Google Dialer if you changed defaults.

Your keyword includes "upd" — likely seeking update-related secret codes. Here they are: