Hi Zhao

No I use this adaptater wich is a little different

And this is the problem because the iPhone 5 is not in the compatibility list of this adapter (only iPads)…

But this is what I tried: I upgraded my iPhone 5 to latest IOS (9.3.3)
And.. problem is solved !
The xkey is recognized and I can use it with all compatible apps

So the USB3/lightning adapter need IOS 9 to be compatible with iPhone5

Thanks again and I hope it helps
Have fun with xkey!