Logic Table for LSBFirst.  Least Significant Bit is A.  It would be thefirst bit: A to H

A-D is the First Bit
E-H is the Second Bit

First Bit= 8*D + 4*C + 2*B + 1*A
Second Bit = 8*H + 4*G + 2*F + 1*E

It is done in Hex:  0-9 are just 0-9.   10 is A, 11 is B, 12 is C, 13 is D, 14 is E, 15 is F.