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4.2rev04 update
Date history
Release dateUSA Flag.png June 22, 2010

JAP Flag.png June 22, 2010

EUR Flag.png June 22, 2010

KOR Flag.png June 22, 2010
CDN-added IOSIOS58
CDN-updated IOSIOS9, IOS12, IOS13, IOS14, IOS15, IOS17, IOS21, IOS28, IOS31, IOS33, IOS34, IOS35, IOS36, IOS37, IOS38, IOS55, IOS56, IOS57, IOS61
Wiimpersonator log (U)
Wiimpersonator log (E)
Wiimpersonator log (J)
Wiimpersonator log (K)
Version History
Preceded by4.2rev03
Major revision4.2
Succeeded by4.3

The 4.2rev04 update was a batch IOS update released shortly before 4.3, much like 3.4rev02. It provided various enhancements to IOSes in addition to blocking homebrew. IOSP, ES, and SDI were updated to versions built on March 1, 2010.


  • IOS9 now has a build tag
    • This version of IOS9 was released in Japan in 4.3
    • IOS21 still has this patch
  • Several IOSes have been replaced with copies of other IOSes
  • Added IOS80 to prepare for 4.3.
  • ES now creates /wfs on startup, although it is not used.
  • Homebrew fixes
    • Fixed HackMii Installer Userland+Syscall IOS exploit in all IOSes (including IOS58, which was previously not on NUS)
    • ES_AddTitleFinish now checks signatures
    • In Japan, IOS9, IOS57, and IOS61 were not updated, instead being updated in 4.3.
    • The function used to verify pointers in the kernel seems to have been updated to take the process ID as a parameter instead of determining it automatically from the current thread. The function that required this change is not known.
    • A bug was fixed in SDI where the read and write IOCTLs used an int for the register index as opposed to a short. This allowed any memory accessible by SDI to be leaked to or rewritten by the Broadway, and may have been used by the HackMii Installer.
  • Updated EULA in E and K regions.