HI ak4490
I Just do discover by myself how to install to eMMC but not do it because of being outside of my home.
After flashing armbian, config everything you want, in terminal: cd /root
./install-aml.sh
I found 3 cscripts in /root
Sorry if it is not working, just knowing how to do it
I am new to linux, i am Windows user.
Cheer.