Erase your iPad. Not a restore as that will try to download the update and install it via iTunes.
Settings, General, Reset (It's at the very bottom) and Erase all Content and Settings.
use a backup that is prior to when you downloaded the file to avoid putting it back on somehow. If you restore at all. Depending on what you are doing you might just want to set it up new. If you can use an icloud backup rather than an itunes I'd go that way. In my experience any crashing corruption that might cause freezing etc seems to get skipped by iCloud, but not always by iTunes.