(Solved) I'm not quite sure these stub IOSs pose a threat -- but they certainly have me concerned. I'm wanting to know whether or not they're even worth removing and re-installing. Could I just continue running my system as it is? It doesn't seem to have any problems. All my other IOSs and everything else is in great health. Region: NTSC-U System Menu 4.3U (v513) Priiloader installed Homebrew Channel 1.1.2 running on IOS58 IOS3 (rev 65280): Stub IOS4 (rev 65280): Stub IOS10 (rev 768): Stub IOS16 (rev 512): Stub IOS51 (rev 4864) Stub Edit: Never mind. I've just read up on every IOS. Turns out they're all pretty much useless. An admin/mod can go ahead and delete this thread. Sorry, guys.