I have h96max+ rk3328 tv boxes ram4/rom32
I copy 3 files to /dtb/rockchip/ # I'm not test *fast.dtb
and edit /extlinux/extlinux.conf
LABEL Armbian
LINUX /Image
INITRD /uInitrd
FDT /dtb/rockchip/rk3328-t9.dtb
# FDT /dtb/rockchip/rk3328-mx10-fast.dtb
# FDT /dtb/rockchip/rk3328-a5x.dtb
# FDT /dtb/rockchip/rk3328-box-trn9.dtb
APPEND root=LABEL=ROOTFS rootflags=data=writeback rw console=uart8250,mmio32,0xff130000 console=tty0 no_console_suspend consoleblank=0 fsck.fix=yes fsck.repair=yes net.ifnames=0
then I can boot the box on only sd card (Armbian_5.82_Rk3328-tv_Ubuntu_bionic_default_4.4.154_desktop_20190427.img). thank you ,hexdump , balbes150 .
but no luck for LibreELEC