The only difference I can see from the pics is that one resistor, which has some value (I can't read it) in the 5-mode variant, and zero ohms in the 1-mode variant.
Therefore looping the resistor I circled in black with a piece of wire (or removing it and replacing it with a zero ohm resistor or a piece of wire) might switch your board from 5-mode to 1-mode.
I can't see any other differences. However, it is of course possible that the chips are programmed differently, in which case there is little you can do, apart from ordering another 1-mode device.