I have been using WIzz.it 9 with two RC9500's for years flawlessly. One of my RC9500's died and I bough a used one from eBay which works but I cannot get it to download/upload with the Wizz.it 9.
My current RC9500's are running Boot V4.31 and App V3.10.5. My new RC9500 is running Boot V3.75 and App V3.2.17.
I tried a firmware update but again can't communicate with the RC9500.

I suspect that a different USB driver was used with the older boot/app. Any ideas?