This message was posted on behalf of Intel Corporation
Thank you for contacting us.
That's weird, are you using this guide: https://downloadmirror.intel.com/24748/eng/IntelGalileoFirmwareUpdaterUserGuide-1.0.4.pdf?
About the issue, can you share a screenshot of the tool when it gets stuck? There is also a thread where another user has reported a similar issue and it has a workaround that can be useful for you, check this thread: https://communities.intel.com/message/314930#314930.
We will be waiting for your reply.
Have a nice day.