Can't download 7.1.2 to iphone 4s and i have enough space

I HAVE BEEN TRYING TO UPDATE 7.1.2 SOFTWARE ON MY IPHONE 4 BUT IT DOESN't DOWNLOAD. AND I KNOW I HAVE ENOUGH SPACE. WHAT CAN I DO?

Try restoring your phone and you will need approx 5gb of space to download and update your phone.
this might help.

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