-Taken From WiiBrewQuote:
Dop-IOS MOD is a modification of the application Dop-IOS that allows you to choose which IOS you would like to use to install other IOSs (with the trucha bug if you like), channels, and system menus. It also allows you to install a patched IOS 36 to use to install fakesigned content if you don't have any other usable IOSs like Trucha Bug Restorer does.
Authors: Arikado, giantpune, Lunatik, SifJar, PhoenixTank
This app is quite useful. As you can see from the description, you can select what IOS to use to install other IOS, Channels, System Menus etc. It also allows you to patch the Trucha Bug Back into your IOS, exactly like Trucha Bug Restorer.