Upgrade 2011, 64 GB, iPad 2 (GSM model) running 5.1.1 to iOS 6 or 7 only - not jailbroken
Apple no longer signs any software older than iOS 9, so installing iOS 6 or 7 on your iPad 2 is impossible, whether it's jailbroken or not.

The iPad 2 is getting pretty old anyway, if you need to run newer software then you may as well upgrade to a newer iPad. I suggest looking for a used one on eBay.