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The USB update may not work because his car may not have the right level of ISTA/P to use the USB map update. As indicated in Dracon's thread:
If your vehicle was built 03/2010 and later, the USB version is the recommended version.
If your vehicle was built between 09/2009-03/2010, you will need a firmware update to update using any method (USB or DVD) due to a bug in the firmware. You are welcome to try, however the update will most likely fail at 93.7% and abort updating.
If you vehicle was built before 09/2009, you can only use the DVD version of the update to load the maps into your vehicle unless your vehicle firmware has been updated by a dealer sometime past 03/2010. Then you can use the USB version if you wanted.
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