How can I downgrade iphone 4s to ios 7.1.2 from 8.1.2

Hello,
My iphone 4s cannot connect to wifi.
sometimes I cannot turn wifi on(it's greyed out).
sometimes I can connect but it alternately connect and disconnect
I think this happened when I upgraded my ios to 8.1.2(I'm not sure).
when it's greyed out,Iput it in refrigerator for 20-30 minutes and it becomes ok for temporary.
my iphone is 16gb.

You can't. Apple does not provide a downgrade path for the iOS.
Sorry,
GB

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