hi there so i have this problem my sisters (samsung) tablet with all her data stoped working it would not turn on for long the back flash was flashing as in the light was turning on for a second but even that went away but now i see that it connected to my pc and holding down the power button brings it up as ''Unknown USB Device (Device Descriptor Request Failed)'' is there a way or atleast a chance of data recovery by me or a profesional data recovery center pls help i had it opend the batteries are full (there are two and both are full at about 4 volts which is pretty much as full as it gets with it not charged for like a month now) oh and the bettery is fine and working