If it is not in the Table of Hardware then it is most likely not supported. If you could provide some more information about the vendor, some specs page in the internet, or a wikidevi link it would be helpful.
every device type have specific flash (disk) layout
on the flash, there is radio calibration data, which is again, specific for every device
if you try to flash some random image on router, there is a BIG chance that you will
a) brick device
b) destroy calibration data
so, without serial console, bootlog, and similar "hacking" no one could be sure what is proper DTS (device tree / hardware description) for your router