Using Cios rev 19 installer, after selecting 249, the following IOSes pop-up to be used as base: 57,60,70,37,30 I'm not sure if any of them are safe to select... Btw, System Menu is at 3.2U.
IOS37 as a base is needed for Rock Band/Guitar Hero. IOS38 as a base is best for compatibility with homebrew. IOS57 as a base is best for USB speed enhancements. IOS60 as a base is best for Wi-Fi enhancements. IOS70 as a base is... not really recommended for anything. All of them are safe, it all depends on what you want. Note that if you wish to switch the base IOS (i.e.- base IOS38 to base IOS57), you need to uninstall cIOS first.
no none of them are safe, its just a dirty trick by waninkoko in order to brick your wii, not our wiis, ONLY yours
