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DFU faild to upgrade

Question asked by guo.dexiang on Oct 14, 2011
Hi all:
The device is connected to PC via USB. The software I use is DFUse demonstration V2.2, I can use the software to turn the device into DFU mode, and make it exit the mode too. But after load DFU file and click the upgrade button, the software is no responding. The upgrade process is abort. Here is screen shot.
Who can give some advices?

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