HT5278: About the security content of iOS 5.1.1 Software UpdateLearn about About the security content of iOS 5.1.1 Software Update
Currently Being ModeratedNov 17, 2012 9:09 PM (in response to Rogelio82)
You cannot. Downgrading iOS is not supported by Apple. Also, the decision not to support older versions of iOS are made by the app developer, not Apple. Also, next time to make your posts a little easier to read, please use some punctuation, besides the exclamation points at the end.
Currently Being ModeratedDec 13, 2012 9:39 PM (in response to Rogelio82)
Yup it's called redsn0w, it's unsupported and will void your warranty