I don't understand why you'd need a cIOS to boot a retail game, but try this instead.
(Assuming you have Priiloader installed) Enable the options to block System Menu updates, both online and disc.
Enter System Menu
Boot game through Disc Channel
Voila.
I don't understand why everyone's solution is 'use ModMii'. Use ModMii for what? Installing the new Shop Channel? The options in that program are too extensive for people to simply say 'Use ModMii' when they only want to play a retail game.
lol. That's good advice for someone wishing to boot zelda from the disc channel, but if you read the original posters thread, you would know he asked "Does anyone know how to get the game to boot from retail DVD using Neogamma?"