How to downgrade my iPhone 4s from 6.0.1 to 5.1.1 not jailbroken?

Title says it all i want to downgrade my device to a lower version

You can't the only way you can really downgrade is if before you update to 6.0.1 you saved your older version on computer through a 3rd party program like tiny umbrella if you didn't there's no way for you to truly downgrade your device. For the future I suggest you download tiny underella to your p.c and plug in your iPhone then save this current version so when 6.5 or 7.0 comes out and you wanna switch back then you will be able to

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