In order to boot Armbian from JetHub D1/D1+ with pre-flashed OS on eMMC you need USB-USB cable and do:
- Download Amlogic Burning Tool
- Download latest burnable firmware (testing branch)
- Flash!
More instructions on https://docs.jethome.ru/controllers/linux/din_rail/index.html
Now you can boot Armbian from eMMC.