Q: Your new upgrade render my IPad2 useless

That's rough. I don't know what to tell you - personally I wouldn't have recommended the upgrade.

You could try backing up and restoring the iPad as new - you would then need to re-download any apps you want.

Matt

Do the following, which has been successful for quite a few iPad 2 users - so many, in fact, that I've lost track of how many have said things are working as before, for them once again!

It's a reset to factory default condition with your iTunes program (and not simply an erase on your iOS device). Be sure to always do your backups, and an iTunes backup is preferred because it's complete and the iCloud backup is not and has some thongs left out (see the tech notes on it).

Choosing an iOS Backup Method (Should I Use iTunes or iCloud to back up ...)

https://support.apple.com/kb/HT5262

Back up and Restore your iOS Device with iCloud or iTunes

http://support.apple.com/kb/ht1766

iTunes: About iOS Backups

http://support.apple.com/kb/ht4946

iOS: Troubleshooting Encrypted Backups

http://support.apple.com/kb/TS5162

Use iTunes to Restore your iOS Device to Factory Settings

http://support.apple.com/kb/ht1414