The driver seems to set the interface to double the baud rate
requested. For example if the driver is set to 4800 baud the
F5U103 is actually set to 9600. I think the change needed is to
amend the number 230400 in the source to 460800 but I have not
confirmed it. Amending the bytes 03600084 in the executable to
07600008 seems fix the problem.