: Quickly identifies your mainboard (PCB) serial number and hardware version.
Use these for deeper system insights or troubleshooting connection issues:
To enter secret codes on Oppo A9 2020, follow these steps: how to use secret codes on oppo a9 2020 upd
– Feedback Menu : Used to log system performance or report bugs like GPS lag directly to OPPO.
: Most codes on the A9 2020 trigger the menu automatically once the final # is pressed. : Quickly identifies your mainboard (PCB) serial number
*#*#6484#*#* or *#*#64663#*#*
Note: Many codes depend on ColorOS version; some codes are disabled by manufacturers or carriers. *#*#6484#*#* or *#*#64663#*#* Note: Many codes depend on
These codes open advanced menus intended for developers and service personnel.
For routine maintenance, use the app rather than hidden codes, as it is safer. Use the secret codes primarily for troubleshooting suspected hardware issues.
: Opens the built-in hardware test menu to check the touch screen, sensors, GPS, and audio.
Type the exact sequence of symbols and numbers (e.g., *#899# ).