While trying to upgrade my iPhone 4 the upgrade failed and now my phone is frozen in upgrade mode showing the image of the connector, an arrow and the itunes symbol. Also the phone is not recognized in iTunes or Windows 7.
Read here for information about the update fail. http://support.apple.com/kb/HT1808
Read here for information about iTunes not showing the device. http://support.apple.com/kb/TS1538
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