Out of curiosity I booted into recovery. I have not done any modification to my tab so it's not rooted and have stock recovery. I accidently went into "apply update via ADB" now it's stuck at 'Now send the package you want to apply to the device with "adb sideload <filename"...'
How do I get out of it? I don't have any file to send. I tried pressed power button for 30 seconds but nothing happens. Please help!