If you see "Nothing found" in the ToH, then this device is not supported by OpenWrt.
To know if if possibly could be supported, a clear knowledge of the chips used in this device is needed.
The metal cans shown above do not allow to identify the chips.
FCCid 2AD8U-FZCWI2B1 does not help either (no internal photos in the FCC exhibits).
You could try to hook up a serial connection (that pinheader looks like it could be serial) and see what you get from there.