Take a look here: http://osxdaily.com/2014/09/21/downgrade-ios-8-back-to-ios-7-1-2/
According to the Apple signing status page, the window for downgrading has closed.
What problems are you having with your iPad2 and did you go to 8.1?
On my IPad 2 I updated my OS to the new 8. Os. I have had numerous problems with it.
My question is this. I have an IPad 3 that I have not updated. Can I back up my 3 and then download it to my 2?