You shouldn't have to downgrade. NitePR will work as long as you have CFW. Just make sure your using the correct codes for the patch. When you look at the update (via save game folder) you should be able to see what update your on. A new code patch is just something (in this case) that Zipper is trying to do to stop hackers. Usually a patch fixes bugs or tweaks and adjusts problems that the game has (in this case, the hackers).