U disk upgrade
1, U disk formatted as FAT32.
2, the firmware is placed in the root directory of the U disk.
3, insert the product USB interface.
(If you can see the interface, you can see the progress of the upgrade on the interface. If you can't see the interface, connect the box to the USB power supply and insert the USB disk for 3 minutes.) This method is called blind rise.
4. Dial the U disk according to the reminder.