How To Use Secret Codes On Oppo A9 2020 Upd =link= — Top-Rated & Hot

: Some codes, particularly those related to "Factory Reset" (like *#8778# ), may erase your data immediately without a confirmation prompt.

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The most important code. Accesses hardware manual tests for screens, speakers, cameras, and biometric sensors. International Mobile Equipment Identity (IMEI)

Secret codes (often called USSD codes or MMI codes) are special sequences of characters that you type into your phone’s dialer to access hidden menus, diagnostic tools, and testing modes.

While many codes provide static information, the true power of these "secret" menus lies in the diagnostic and engineering modes. These aren't just for show; they are powerful, real-world tools. how to use secret codes on oppo a9 2020 upd

*#*#426#*#* — Access Firebase Cloud Messaging diagnostics for push notifications.

*#*#3646633#*#* (or *#36446363# for some versions) — Opens the main Engineer Mode menu, allowing for advanced hardware testing, cellular band selection, and audio tuning. Part 3: Deep Dive: Engineer Mode & Hardware Testing

Changing settings in the Engineering Mode ( *#899# ) without knowing their function can lead to loss of network connectivity.

Displays the mainboard (PCB) serial number and hardware version. : Some codes, particularly those related to "Factory

: View connection status and events related to Firebase Cloud Messaging.

Using secret codes on your OPPO A9 2020 gives you diagnostic power usually reserved for repair technicians. Whether you need to test a faulty proximity sensor, check real battery voltage, force an OTA update, or retrieve your IMEI, these codes save time and effort.

: Displays the specific absorption rate (radiation level) for your device. Advanced Testing & Feedback

*#888# Displays the PCB (Printed Circuit Board) serial number and hardware version. These aren't just for show; they are powerful,

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

To use secret codes on your OPPO A9 2020 Go to product viewer dialog for this item.

: Displays your device’s unique international mobile equipment identity, essential for warranty claims or reporting a lost phone.