I have iphone 4s and i update it to last version of ios7.1.2;this version of ios use battery  more than ios 7.1.1 ;now i want to back to that version!help me how can i?

i have iphone 4s and i update it to last version of ios7.1.2;this version of ios use battery  more than ios 7.1.1 ;now i want to back to that version!help me how can i?

Downgrading isn't possible. iTunes won't install iOS versions older than the latest compatible release, and if one's somehow installed anyway, Apple's servers won't activate the device afterwards.
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