For the TL;DR crowd, Windows 10 was not recognizing any device flashed with older versions of RfCat firmware. Dominic Spill had already identified the issue and created a pull request to fix an extra byte in the USB descriptor length field. Turns out Atlas had originally added that extra byte so that older Windows versions would recognize the dongles. Thus, RfCat has been updated to address this issue and Windows 10 will now recognize devices flashed with RfCat firmware. The rest of this post will outline the process I took to track down this issue and help get Dominic’s pull request merged.