I have 2 NanoPC-T4 and I used eflasher from the SD card to program the emmc. Works without fail. I used Win32DiskImager to create the SD card from the image downloaded from the FA website. I've installed Ubuntu as a test but currently using Android 8.1 on them. You u-boot shows that it can't find t...
UPDATE: I have made some progress getting images onto the T4 by using another PC, originally I was using a VM on my Macbook, seems you need a physical PC to get the tools to work correctly.
Still not booting into a usable state though.