1. Enter the reinstall interface
Find the u disk DVD boot
Then select EFI boot
Then it will enter the U disk boot interface
After startup, you can enter the u startup interface
Then do what you need
Details can be found here
The following are remarks:
U Boot U Disk Boot Disk Creation Tool UEFI Edition Make U Disk Boot Disk Tutorial_uboot
msdn.itelly.net
The above is the system download interface
Then
Just put it in