How to upset my Iphone 6 plus from 8.0 to 8.1?

I don't want the newest update, because I want to jailbreak. My phone crashed and is on the loading screen. It won't back up without doing it to the newest update. Someone please help.

Go to settings and you will see the update. Make sure you have enough storage room

I need a way to do from the computer. I don't want the newest update.

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