Navigate to Display → LCD Test . The screen will cycle through Red, Green, Blue, Black, and White.
Opens the "Engineering" or "Factory Test" mode to verify hardware like the screen, sensors, and camera. *#09#* How to Use Secret Codes on VIVO V40
Below are the most useful codes for troubleshooting and information gathering on the VIVO V40 series. IMEI Check Displays your phone's unique IMEI and serial numbers. *#*#4636#*#* Testing Menu Shows detailed Phone Info, Battery Stats, and Wi-Fi usage. *#558# Factory Test Navigate to Display → LCD Test
Launches the "Engineering Mode" to test hardware like cameras and sensors. General Info How to Use Secret Codes on VIVO V40
If you accidentally changed a system setting via Engineering Mode: