No, I have not contacted UART. I think it is possible to LibreELEC on U9-H.
What I've done:
SP 128GB micro SD card class 10
win32diskimager
Armbian_5.37_S9xxx_Ubuntu_xenial_3.14.29_server_20171208
added: dtb.img form FW007A 20171020
I can not get it to boot from SD card.
If you have anything that will help me, PLEASE inform me...