Here you can learn which settings you have to make on the Dell WYSE ZXoD (aka 7010) to be able to start the device with a UD pocket.
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Boot up the Dell device.
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In the BIOS go to the Advanced tab.
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Enable Boot From USB.
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Change to the Boot tab.
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Change the boot priority to make USB HDD the default by moving it to the top.
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Save the settings
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Put in the UD Pocket
See this video: