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

whats the difference between b85m-d3h bios version F9 and F12?????
« on: September 18, 2014, 12:18:59 pm »
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??