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Hi there,
First try uninstalling and reinstalling iTunes.
Let me know if that helps.
If that does not work, try this:
1. Right click my computer --> Properties --> Device Manager
2. Right click Apple DFU Driver --> Uninstall.
3. Unplug USB cable
4. Reconnect USB cable with phone attached in DFU Mode.
Did that work for you? We would love to know if that fixed your issue.
Thanks!
When putting my iphone 3g (4.2.1) into dfu mode, windows (win 7 ult x64) picks it up and fails to install a driver for the usb dfu device. Apparently this lack of driver also prevents redsn0w from detecting that the device is now in dfu mode, and I receive the message that I didn't follow the dfu mode instructions correctly. I've been looking and haven't found any useful information on this issue so far. Any suggestions?