downgrading is not supported by Apple and doing so has the potential to brick your device. so, you can't. if you have feed back for the now iOS you can provide that here: http://www.apple.com/feedback/
I'm sorry, but Apple does not provide a downgrade path for iOS. Because downgrading is unsupported by Apple we cannot discuss it on these forums, but you can use Google to find information on how to install an older version of iOS on any iDevice.