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Thread Starter 

I hv a iPhone 4S, and since i updated my IOS to 6.1.3, my phone gives me many problem

such as

sms halfway hang

hang in dropbox

my bluetooth goes off and cant restart

my wifi cannot work

my hotspot works occasionally


too much headache, how to switch my IOS back to 6.1.1 ????

I tried to use the restore button in iTunes to factory settings, but it is still at 6.1.3


Anyone can help???