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I cannot charge battery via USB cable to PC after upgrading firmware and android version to 4.1.2 (Galaxy S2 mobile). Anybody please explain to or advise me, how I can I get my PC charge my mobile's battery via USB cable.

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Many USB ports on computers do not have power sufficient to charge a phone battery. Does the phone charge with the plug-in type supplied with it? Some computers will advertise a charging USB port. The default current (amps) is 1/2 A or 500mA in a standard USB connector. It is not uncommon for tablets to require 2 Amps.

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