A small number of codes, like #7465625*638*# , prompt for this because they are designed to manage network locks (SIM locks) that carriers use. Unless you are an advanced user or a technician with the specific unlock code from your carrier, it's best not to use these codes.
: Quickly view all events saved in your device's connected calendars. Security & Troubleshooting How to Use Secret Codes on OPPO Reno 13 Pro
Here are some popular secret codes for Oppo A9 2020:
Shows the Specific Absorption Rate (SAR) level, indicating the amount of radio frequency energy absorbed by your body. (Hardware Revision): how to use secret codes on oppo a9 2020 upd
Perform a forced restart by holding the power button and volume down button simultaneously for 10–15 seconds. If the issue persists, boot into Recovery Mode (Power + Volume Down) and perform a factory reset—though this will erase your data.
simultaneously to enter the Recovery Menu for data wiping or system updates. Developer Options: Settings > About Phone
This is the most vital code for hardware troubleshooting. It opens a menu to test the touchscreen, display, audio, sensors, and camera. A small number of codes, like #7465625*638*# ,
If you suspect a specific part of your phone is failing, you can trigger individual tests: Codes for OPPO A9 2020 - HardReset.info
Sometimes, third-party dialers do not handle USSD codes properly.
– Software Info : Detailed view of your Android version, ColorOS build, kernel, and branch details. Security & Troubleshooting How to Use Secret Codes
To use secret codes on your OPPO A9 2020 Phone (Dialer) app and type the code exactly as shown
*#*#564548#*#* (translates to # #5(OTA)# # ) Opens the hidden OTA update log. You can see when the last update was attempted, error codes, and download URLs.
If you've ever wondered what lies beneath the sleek surface of your smartphone, you've likely come across the concept of secret codes. For the Oppo A9 2020, these are more than just internet rumors; they are a set of hidden shortcuts that can transform your phone into a powerful diagnostic and customization tool.
✅ Most reliable after ColorOS update: (Oppo's own hardware test menu)