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

The is a versatile device, and like most Android smartphones, it hides a powerful set of secret codes (USSD codes) designed for developers, technicians, and power users. These codes provide instant access to diagnostic tools, system information, and hidden settings, often allowing you to bypass complex menu paths.

Frequent factory resets can degrade the internal storage over time and cause unnecessary wear on components.

To use secret codes on your OPPO A9 2020 Phone (Dialer) app and type the code exactly as shown

In most cases, the menu or information will after you type the last character. If nothing happens, press the Call button to execute the command. Essential Secret Codes List Below is a curated list of frequently used codes for the OPPO A9 2020

*#*#273283*255*663282*#*#* Opens "File Manager for Update Dump". Use this to delete corrupted update cache files that prevent new updates from downloading.

After recent updates, you may find that many traditional codes have been replaced by the , which can be accessed using *#800# . This menu allows you to:

The remains a versatile device for many users, even after its permanent discontinuation . Understanding its hidden "secret codes" (also known as MMI or USSD codes) can help you troubleshoot hardware issues, check software versions, or perform diagnostic tests without needing external tools. How to Use Secret Codes on OPPO A9 2020