Aah i know the problem! Its an asus board. I have a asus p8p67 le.
The trick that did it for me is use clover as legacy described somewhere here on the forum.
Then go back to clover configurator and load the config.plist from the internal hdd. Then browse the tabs on the left there should be...
I got the exact same problem with the fenvi t919.
Bluetooth works fine wifi too (but i always need to select to connect).
I know that the bluetooth has a stable connection because of the magic keyboard mouse and trackpad that work flawlessly.
Just handoff and continuity doesnt work.