Very strange, coz i have device that actually works - here is my quote from "Remote follow focus." theme back in 2016:
"
...That Aputure V Grip USB Focus Handel V-Grip have just arrived and I make a quick test: it works, but...
Not from the first attempt and i several times freezes camera,
finally i realised that it's important to first connect and switch on the device, just after that turn on the camera.
And even this way sometimes it just not works. I need to restart camera several times.
It has 3 speed presets selectable by button, two of them seems too slow for me.
It can control aperture too, has focus/aperture switch button.
Zoom button activates x5/x10 view....
"
So, what so special with this one?