Interesting, flashed back AGAIN the old image, but flashed your uboot, mounted and copied the sunvell file, and when booting, this appears:
Starting kernel ...
Error: unrecognized/unsupported machine ID (r1 = 0x00000000).
Available machine support:
ID (hex) NAME
00001029 sun8i
Please check your kernel config and/or bootloader.
Seems to be that the uboot doesn't have the machine id defined?
EDIT: Manually setting machid in uboot with 1029 worked
setenv machid 1029
saveenv
But armbian can't find the emmc... is the kernel making troubles? Will check