Can V1.2 Hardware work with 5.0.4 SW?

on V1.2 Hardware, I have just connect one X-axis encoder according to the assembly document. I have checked V1.3, it has connected both of two X-axis encoders. I would like to know whether latest 5.0.4 can work with one X-axis encoder only? Thanks.

At this time X2 encoder is not implemented yet, I assume it will be available when Farmduino will be sold.