connect the USB to a free USB3 port.
Then the NanoPC-T4 will boot normally.
This version already has support for starting from USB. You can easily run test systems from any conventional USB stick. It's much easier than using an SD card.
Write the image to a USB stick, configure as usual DTB, connect the USB stick to T4 in USB port and turn on the power. After a few minutes, the system should start from a USB flash drive. If nothing starts after 5 minutes, you need to find a port from which the system can start. You need to try to connect the flash drive to other ports and check the start.
All versions (with kernel 4 and 5) run from USB media. The latest version 20191117 with kernel 5 I run on N6 (Kodi-19 interface works), but the video does not work yet.It is interesting to check the running of kernel 5 on T4. It would be good if there were users with NanoPI M4 and checked the launch of LE on this model.