Why won't it let me install ios 6?

I want to install ios 6 but it is saying i need atleast 2.5 gigs of storage space. I have 3.8 gigs of storage available in icloud and i barely have 8 gigs of stuff on my iphone 4s 16 gig.

I'm having the same issue:/

You Will Have To Fully Back Up Your Phone To The Cloud And Then Do A Full System Restore On It… Then Just Switch Over To IOS 6 And Back Date From Icloud

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