In = 0bABCDEFGH
Out = 0bXXXXXXXX // Some random byte

Out = 0bXXABCDXX

(0b00111100 & (IN>>2)) = 0b00ABCD00

out |= (0b1111 << 2);
out &= (in >> 2 | 0b11000011);