1. Format the U disk as FAT32
2. Put U2W_Update.img in the root directory of the U disk
3. Power on the product (power on by plugging in the USB adapter, *do not use the car USB to prevent power failure during the upgrade)
4. Insert the U disk into the product USB port
5. The indicator light flashes alternately when upgrading, and the indicator light is always on when the upgrade is complete
6. Insert the car's USB port to use