We are using up2date Solidrun U-boot which automatically detects the board and select proper DT. If this is not done properly, you need to force loading it. Editing /boot/armbianEnv.txt or boot.cmd/scr and changing / forcing correct DT for your board. I am affraid this is probably the only way. Most likely this is the problem ... My Cubox i4 works without a problem and that is the only one I have.