whats the difference between b85m-d3h bios version F9 and F12?????

[harkanwal]

i m using Ga b85m-d3h motherbord with i5 4440 4th gen processor its working fine but when i connect my iphone 5 via usb port it rapidly connect and disconnect. should i need to update my bios or anything else?//  and whats new in F12 bios??