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The instructions haven't been updated. Go back to the Arudino site Intel® Galileo Boards and Kits — Software Downloads and either download and install the Galileo Updater Firmware tool or the earlier version of the IDE for Galileo 1.5.3 (I use 1.5.3 with no problems)
Have you already seen the Galileo Firmware Update User Guide? Follow this helpful guide and let us know the results.
You can download the pdf from Intel® Download Center . Look for “IntelGalileoFirmwareUpdaterUserGuide-1.0.4.pdf”