HT1766 ever since i updated my iphone 4 it's gone very slow and at times you feel it has hanged. how to go back to os 6.1.2

Can somebody help me on how to go back to OS 6.1.4 for iphone 4

You cannot go back. Downgrading is not supported by Apple.
Note: iOS 6.1.4 was only for the iPhone 5.
Have a look here... for iOS 7 tips...
http://osxdaily.com/2013/09/23/ios-7-slow-speed-it-up/
ALSO...
Try This...
Close All Open Apps... Sign Out of your Account... Perform a Reset... Try again...
Reset  ( No Data will be Lost )
Press and hold the Sleep/Wake button and the Home button at the same time for at least ten seconds, until the Apple logo appears. Release the Buttons.
http://support.apple.com/kb/ht1430
And try a Reset all settings ...
Settings > General > Reset > Reset all Settings.
This will return all iDevice settings to factory defaults... you will not lose any data.... But you will have to re-enter all of the device settings.
If the issue persists...
Connect to iTunes on the computer you usually Sync with and Restore
http://support.apple.com/kb/HT1414
Make sure you have the Latest Version of iTunes (v11) Installed on your computer
iTunes free download from www.itunes.com/download

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