I know there were USB 3G adapters that quick working after the 2.2 update so this may be a related thing. You have to keep in mind that Entourage never officially released the 2.2 update.. instead it was a beta version they rushed to get out to the public before the company went under.
I suspect that they may not have developed the drivers necessary for USB devices to function properly in 2.2. You may have to revert back to 1.6 to get it to work.
AFAIK no one has developed any fix for this as there aren't many people with this device.. any many fewer that use a USB device at all with theirs.
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