I have a 2009 FLI filter wheel, CFW-2-7. It is connecting via USB and is visible on the system, and in fact it gets a good ways through the connection process before crashing. Here are the last few lines output by kstyars before crashing:
org.kde.kstars.ekos: "FLI CCD is online."
org.kde.kstars.indi: FLI CFW : "[INFO] Connecting to FLI CFW..."
org.kde.kstars.indi: FLI CFW : "[INFO] Filter wheel is online. Retrieving basic data. "
org.kde.kstars.ekos: "FLI CFW filter is online."
QObject::disconnect: Unexpected null parameter
Segmentation fault