Why does adb return offline after the device string?

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Try the following:

  1. Unplug the usb and plug it back again.

  2. Go to the Settings -> Applications -> Development of your device
    and uncheck the USB debugging mode and then check it back again.

  3. Restart the adb on your PC.
    adb kill-server
    and then
    adb start-server

  4. Restart your device and try again.

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