You have probably seen the manual I created. Could you please provide me
with some keywords/documentation on your entire setup and the WinUSB.sys/inf
configuration?

In fact, I didn't see the manual. The link is a bit difficult to see, being the last line of the page. Don't you think it should be on top of the page? With big signs point to it? Maybe a blinking tag :)? I'll document my setup and send you, so you can update the manual.

 
we at sysmocom do not do electrical testing with the flex cables and so
far we have had only one defect (the PCB was soldered off-by-one to the
cable). You mentioned you made a continuity test and it worked. Have you
been able to see what is wrong with the cable? Feel free to use the webshop
address of sysmocom to report the defect (if any).

Yes, I indeed did a continuity test and the signal went through all the wires. I really don't know what is wrong with the cable, will do some more testing on it later this week since it is a bit difficult to get one of those where I live.

Thanks.
--
Atenciosamente,
                          Hugo Frederico Soares