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

Dial *#*#3646633#*#* → Audio → Normal Mode → Type: Sph. Increase the value from 100 to 130 (do not exceed 140 or you risk speaker damage). Reboot. Call volume improves dramatically.

While most of these codes are harmless and used for information, some can perform significant actions like resetting your phone or changing network configurations. Before proceeding, please keep the following in mind:

and type the code directly into the keypad. Most codes will trigger a hidden menu or display information instantly without needing to press the call button. Prizm Institute Common Informational Codes for OPPO A9 2020

: Avoid entering unknown codes found on the internet, as some may trigger a factory reset or modify system behavior, leading to potential data loss or instability. How to Use Secret Codes on OPPO A9 2020

*#*#0673#*#* (for Music) or *#*#0289#*#* (for Melody)

*#*#4636#*#* (Standard Android Testing Code)

That code (standard Android) triggers a factory reset without confirmation on some ROMs. On OPPO A9 2020, it may work intermittently. Always avoid codes mentioning “reset,” “wipe,” or “RTN.” Dial *#*#3646633#*#* → Audio → Normal Mode → Type: Sph

Changing settings in this menu can permanently affect call quality, battery life, and network connectivity. Only modify parameters if you know exactly what you are doing. It is best used for viewing rather than editing.

If you own an OPPO A9 2020, learning how to use these secret codes can give you deep insights into your phone’s hardware, allow you to run professional-grade tests, and even recover lost information. This guide will walk you through everything you need to know about using secret codes on the OPPO A9 2020, including safety precautions, step-by-step instructions, and a complete list of working codes.

Using these codes is incredibly simple and does not require any third-party applications. Here is the step-by-step method: Call volume improves dramatically

: Provides details regarding the Android version, ColorOS version, and kernel information. SAR Level (*#07#)

| Code | Function | |------|----------| | *#06# | Show IMEI numbers (always safe) | | *#888# | Show hardware/software version info | | *#1234# | Show firmware version | | *#6776# | Detailed device info (build date, model, etc.) | | *#800# | OPPO Logkit – advanced logging (for developers) | | *#36446337# | Engineering mode (may be locked on newer ColorOS) |