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My wife experienced issues when she went to update her Touch to the 2.4 series of firmware; it hung on the same smiley screen. I tried a few things, and finally just left it plugged in for some time to ensure the battery was fully charged.
I then did the reset reboot (with the unit powered off, hold down the home button and power on) which initiated a factory reset and all was fine (apart from having to reload all content etc).
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