I updated Kies today and my Samsung Galaxy S2 phone doesn't connect to my pc via Debug Mode any more.
Below is the screen shot
When I uninstall that and try to reconnect I get an error saying driver install failed.
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Right-click on that "SAMSUNG_Android" and select
Uninstall. Then make sure the
Delete the driver... option is checked, and click the
OK button. This should clear out the old drivers from the system. Now unplug the phone and try uninstalling and re-installing Kies. Reboot the PC and try plugging the phone in again.
If you are on Windows 7 64-bit, you may be able to bypass Kies software by installing this driver (remove the "SAMSUNG_Android" from Device Manager again before installing the driver.)