That is a scam.
There is no jailbreak for iOS 7.1 at this time and you cannot go back to a previous version of iOS.
I have never JB a device and i'm interested in JB'ing my iPad 2. I came across this Youtube video. Is this BS?
iOS 7.1 JB video
http://www.youtube.com/watch?v=gWQ0mQPAMio
Anything "offering" iOS7.1 JB is scam.