I wonder if there is a possibility to get working WiFi after installing the Crystal HD card? Does ATV flash silver support WiFi Usb dongles?
I'm not sure if anyone has had success with a wifi USB dongle, but I know many people have setup an Airport Express as a wifi exension and connected that to the Apple TV via an ethernet cable.
It's not a perfect solution, but will probably save you a lot of headache from trying to get a USB dongle setup.
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