Ok..i actually managed to pair my DS4 V2 gamepad.
Here is how.
Trick here is to actually do NOT add pid and vid of DS4 to xpad_devices, that will just prevent ds4 to work while connected to usb.
(this assumes that you already installed plugin and added your dongle (bluetooth adapter) pid and vid to xpad_devices)
example: 0x0B05, 0x17CB, Asus USB-BT400, PTYPE_BT
then , turn off console, plugin ps3 gamepad to console (via cable), plugin your bluetooth adapter to console ->turn on console
At this point your ds3 gamepad might start to rumble constantly. dont know way around that, but we wont be using it anyway after this
+your DS4 MUST NOT BE CONNECTED to console bluetooth before this! If it was, delete gamepad connection from accessories!
1. your ps3 controler is vibrating and not responding , press PS button, to connect to usb
2. press space+start+square button to open plugin mod menu
3. go to bluetooth menu you will see here waiting for connection requests
4. now on DS4 gamepad press and hold PS+Share (this is standard button combo for connecting gamepad to bluetooth)
5. your ds4 is now blinking opened to be connected to bluetooth. So, in console plugin bluetooth menu press (Pair with bluetooth device)
wait a bit. few seconds later your DS4 light will turn dark blue. If this happened you are good to go!
6. in bluetooth menu of plugin scroll to bottom and click on save this PS4 bluetooth
Done.
Disconnect your ps3 gamepad , you wont be using it any more.
Few notes tho:
DS4 will disconnect when ever you start game or exit game. Need to reconnect every time. Just press PS button.
DS4 will not have plugin support if connected with cable! Only BT will be emulated as PS3. I dont know way arround this. (If we add pid and vid gamepad will stop working on usb altogether. So i will just say that that part is broken for DS4. So do not add that.
I did this procedure couple times. On different consoles. It worked on all.
4.88 evilnat cfw.