Do I understand correctly that you are using the same SD card to activate the multi-boot on all TV boxes ? On some TV boxes activation takes place this SD card, and one model does not work (error message with a photo) ?
Judging by the logs, you have a model n200C . So you need to pick up the dtb from this group. When you start with dtb n200C_1GB system starts but a lot of mistakes from the media. Multiboot you have already activated, so try to use a USB flash drive to capture the image and add dtb n200C_1GB. I have my doubts that your model has real 2GB of RAM, it is desirable to open the case and get the brand of memory chips.
Perhaps the manufacturer specially recorded in the built-in dtb is not correct RAM, the kernel in Armbian itself checks for physical memory access and sets the real value (which it itself received under test).