I have recently completed an initial boot of Armbian 20.11.3 (stable) which appeas to be Debian Buster under the skin. I have a Sabrent 256GB NVME ready to go (works on other Rk3399 boards and my Pinebook Pro). I am booting from a 64GB uSD card.
Using Armbian-config, I was able to update my board's SPI u-boot to mainline and rebooted to confirm I didn't mangle the SPI. The next step was to run the nand-sata-install.sh script to get it to copy the root and boot filesystems onto the NVME drive. While everything has worked so far and I copied the latest nand-sata-install.sh script from Github yesterday (when it was 8 days old), I'm getting an error: "This tool must run from SD card" - I'm running it from an SD card, so assumed it was an error that was complaining about permissions. However, I tried with both sudo and with becoming root. The same error appears in all cases.
Burnt_SoCs's post in nand-sata-install.sh will not run from root after upgrading to mainline U-boot on RockPi 4c v1.4 was marked as the answer