To format the SD card in the AKASO V50 Pro action camera, please follow these steps:

1. Press and hold the Power button for 3 seconds to turn on V50 Pro.
2. Enter General Setting.
3. Scroll through the screen to find the “Format Card” option.
4. Tap ”Format Card”, the screen shows “Yes/No”.
5. Tap “Yes”, the screen shows “Please wait”. Then you format your microSD card successfully. 

Note： Note that formatting the SD card will erase all data stored on it, so make sure to back up any important files before proceeding. You may also want to format the card periodically to ensure optimal performance and prevent file corruption or errors.