anything that was cracked by Duplex or NODRM will work on the 4.30cfw. I can confirm this, i have 53 titles and checked them all and they booted up and work just fine, same with all my backups that were fixed with either NODRM, Duplex, or Zombiekillah's patches. if you have games already on there before updateing to 4.30cfw there is no need to resign them. I even checked all the 4.21cfw signed homebrew and all are working fine.
"Snake. We're not tools of the government, or anyone else. Fighting was the only thing... the only thing I was good at. But... at least I always fought for what I believed in." - Gray Fox