I have a problem with my tablet. Who used Odin3 (program)?

My tablet is GALAXY Note 10.1 - GT-N8000. It doesn't work properly and I can't use it. So, now I've decided to unbrick/restore my tablet by using Odin3 (program). I downloaded firmware for my tablet. But during the the installation something went wrong and the program shows "HIDDEN" (for about an hour already). And the installation hasn't either completed or failed. In other words, the installation isn't completed.

The main question is: Can I close the program or disconnect my tablet and then try to estore my tablet again? I hear that the tablet can be broken if it's disconnected during the installation. Is it true?
Maybe I have to wait until the program shows "FAIL", but how long I have to wait I don't know.

Please help. How can I solve this problem?

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