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First off, IOS257 doesn't actually exist. The numbers don't go up that high.I've noticed something when trying to patch mIOS's where it says something about IOS 257. Does tis require IOS 257? Because I don't have it. Like do I install IOS 257 then install these WADs with it?
Anyway,
There are a number of different IOS that have permissions to be able to install stuff. 249 and 236 are the most commonly used. There are also WAD managers like MMM or WAD GUI that don't even ask you which IOS to load to use for the installation so take your pick.