Itunes cannot detect iphone 4S after upgrading to ios 8.0.2

i need help with this problem, i recently updated my iphone from 7.1.2 to ios 8.0.2. after the upgrade my iphone cant be detected by itunes either on PC or MAC, and the phone doesnt charge anymore. i tried to downgrade it using the DFU mode but still cannot be detected... does anyone had this kind of problem?

Have you tried a different cable?

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