Firmware update progress stuck at 0

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http://androidforums.com – Hello, When i installed Kies and connected my Galaxy Tab GT-P1000, it suggested me firmware upgrade to Ver on my tab screeen it says Downloading "Do Not turn off target" but the percentage in kies is 0% from past 1 hour. Please help me how to escape from this firmware upgrade. Can i unplug the cable? or turn off either PC or TAB? please help here. (General)