I've installed yosemite on an hp dv6690el (external hdd); all works perfectly on osx, eccept wifi.
I noticed that the setup changed my bios... at the first boot on windows (internal hdd) after the setup of yosemite, i had a bad surprise.
When the wifi is ON, windows tells me that the wifi is "deactivated"... when i put it OFF, it tells me that the wifi is "disabled" i have solved this problem one time by doing an update of my bios with the official setup.
Now, i've tried to log on Osx, shutdown, log on Windows and it gives me the same problem!! i've tried to update again the bios but with no luck..
How to restore my old bios or make the wifi works on windows?