The factory reset is done with the Vox "off", then press both the volume + and power button for about 15 seconds. Was your Vox off?
If that doesn't work, someone else has successfully updated the firmware by going to the apps menu and using the "Firmware Update" app to install the new firmware. Sometimes it doesn't work the first time, multiple tries can eventually lead to success.
Many posts exist on the forum about this problem, try doing a search and some reading, several different solutions were found.
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