I downgraded using this website and my wifi worked immediately. http://www.iphoneheat.com/2009/04/how-to-downgrade-iphone-os-30-to-221-step-by-step-guide/
pchristen
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I think it may be if you are trying to connect to a router without security or is an older router that is using WEP not WPA. It only happens in certain routers.
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Two days ago I ignorantly updated my ITouch to OS 3.1 and my WIFI quit working. Apple refused to provide tech support even though I had updated the OS (not application) on a computer device that day. I've tried all the fixes like leaving the network, resetting newtork settings, and doing a full restore of factory settings and restore a backup. I've updated the firmware on my router. My itouch doesn't even detect or join the network most of the time. Extortion
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