The "FiiO X3 & X5 USB Drivers" can also be used with the Fiio X3 2nd generation.
You only need to replace a few line in the "TUSBAudio.inf" and "TUSBAudioks.inf" files which are in the setup folder.
Under the [Models] section in both ".inf" files replace:
[_Models]
"FiiO X3"=_Install, USB\VID_2972&PID_0001
"FiiO X5"=_Install, USB\VID_2972&PID_0005
[_Models.ntamd64]
"FiiO X3"=_Install, USB\VID_2972&PID_0001
"FiiO X5"=_Install, USB\VID_2972&PID_0005
With
[_Models]
"XMOS XS1-L1"=_Install, USB\VID_20B1&PID_0001
"XMOS XS1-L1"=_Install, USB\VID_20B1&PID_0002
"XMOS XKC-SU1"=_Install, USB\VID_20B1&PID_0008
"FiiO X3"=_Install, USB\VID_C502&PID_0001
"FiiO X3"=_Install, USB\VID_2972&PID_0001
"FiiO X3K"=_Install, USB\VID_2972&PID_0003
"FiiO X5"=_Install, USB\VID_2972&PID_0005
"Smuma"=_Install, USB\VID_20B1&PID_2012
[_Models.ntamd64]
"XMOS XS1-L1"=_Install, USB\VID_20B1&PID_0001
"XMOS XS1-L1"=_Install, USB\VID_20B1&PID_0002
"XMOS XKC-SU1"=_Install, USB\VID_20B1&PID_0008
"FiiO X3"=_Install, USB\VID_C502&PID_0001
"FiiO X3"=_Install, USB\VID_2972&PID_0001
"FiiO X3K"=_Install, USB\VID_2972&PID_0003
"FiiO X5"=_Install, USB\VID_2972&PID_0005
"Smuma"=_Install, USB\VID_20B1&PID_2012
Dont forget to SAVE and install
Enjoy the Drivers with your Fiio X3 2nd generation
PS don't forget when using windows 8.1 or windows 10 x64 to Disable Driver Signature Verification