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DM355 usb driver under MF



Hi all,

           recently,I'm trying to get .NET Micro framework  working on the dm355 evm.When the tinyclr.bin succeed running on the board, I use an usb cable to connect the board with my PC(XP SP3).

however,the PC always shows that "unknown device".only once,it shows"dm355 xxx",and then I can go on to install the usb driver.  What's the problem?

          Pls excuse for my pool English...

          Waiting for your response,thank you very much!