Under the "Home" tab of the Eye-Fi Manager. You should notice a message in left navigation bar announcing that your Eye-Fi Card needs a firmware update. Click on the "update" link
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Click on the "Update" button and wait through the "Downloading, Firmware", "Updating Firmware" and "Verifying Firmware" progress notices
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The Firmware update will be complete when the information box displays the following message, "Your 'Eye-Fi Card' has been updated to firmware version 1.0496"