See also: System Menu/BS2

The System Menu is software shipped pre-installed into every Wii which allows the launching of games from an officially Nintendo certified game disc, launching of Nintendo Certified channels and Virtual Console and WiiWare titles.

It plays a major role in the startup, shutdown, and transitions between system states; upon starting up, the System Menu's main() reads the following files:

  • /title/00000001/00000002/data/setting.txt
  • /title/00000001/00000002/data/state.dat
  • /shared/sys2/NANDBOOTINFO
  • /title/00000001/00000002/data/cache.dat
  •  ?

Based on the things read by main() (as well as certain flags set in memory?), the menu can take the following actions:

  • Hang (unrecoverable brick!)
  • Boot a disc title directly from cache.dat
  • Shutdown system from GC mode
  • Eject a disc, then shut down (if Eject was pressed)
  • "Shutdown to idle" (Enable WC24, halt PPC)
  • "Launch NAND app from WC24"
  • Enter "recovery mode" (aka IRD mode)
  • Display the Health / "Warning" screen, and proceed on with normal boot

On an un-modded system, it is the first thing a Wii user will see when s/he turns on his/her Wii having pressed 'A' at the Health and Safety screen. An X denotes that no version is available for the applicable region.

The disc-handling actions of the System Menu are governed by a complex state machine known as BS2.


The version number can be found by clicking on the "Wii" button in the System Menu, and then choosing "Wii Settings". The version number is displayed in the top right corner of the screen.

The version identifier consists of two parts: revision (version) number and the geographic region.

For example, 4.3EUR v514, denoted as "0x202, 0x20(32)" (in data) is the actual version and 2 the region EUR.


Version JAP USA PAL KOR Release date IOS Changelog CDN Availability CDN Post Date
Prelaunch X 0 X X Never publicly released Unknown Prelaunch Development. Basically, nothing is known about Version 0 of the Prelaunch System Menu. Remnants of this menu were found in the leaked 'Wii Startup Disc' Nand. The Version 1 of Prelaunch Menu has a screen displaying "Please Insert the Wii Startup Disc..." but it's not known if Version 0 even has this message let alone the background images/colors of Version 1. Remnants of a IOS4v1 were also found in the leaked Nand, so it is possible that's the IOS that runs Version 0. Unavailable Unavailable
Prelaunch X 1 X X Never publicly released IOS4 v3 Prelaunch Development (Does not report a version number.) System Menu has text displaying "Please Insert the Wii Startup Disc. This will set up your Wii Console." Spanish and French versions of message also listed. Contains an image of the Wii Startup Disc with an arrow pointing at an image of a Wii. (The following info may be for a different system menu) CaptainChris2018 used the prelaunch system menu in the dolphin emulator, he tried putting the Mario Kart Wii and Wii Sports iso's in the virtual drive, and they did not work, he tried a Super Smash Bros. Melee iso,(which is a Gamecube game) in the virtual drive, it did not work ever. I guess with my tests, maybe you need a special disk for it to work. Unavailable Unavailable
1.0 64 33 66 X November 19, 2006 IOS9 v1, IOS10 v518? "Launch-Day" menu shipped with early Wii systems, the option to change Country was added in the European version, WiiConnect24 was disabled on all versions of System Menu 1.0 and the Japanese version of this menu runs on IOS10 due to a bug in the implementation of the AOSS feature in IOS9. (This menu does not report a version number.) Unavailable Unavailable
2.0 128 97 130 X November 19, 2006 IOS11 v10 November 19th is the release date for American Wiis. Release date for Japanese Wiis is December 2, 2006. Release date for PAL (Australia) Wiis is December 7, 2006. Release date for PAL (Europe) Wiis is December 8, 2006. Added SD support for savegames, "Country Settings", downloadable System Updates, parental controls, ability to rearrange channels. 97, 128, 130 November 18, 2006; November 30, 2006; December 5, 2006
2.1 X X 162 X January 10, 2007 IOS11 v10 Update to support the News Channel going live 162 Jaunary 9, 2007
2.2 192 193 194 X April 11, 2007 IOS20 v12 "Resolved connection issues that affected a small number of users who connected online through a specific Internet Service Provider and supplied router." 192, 193, 194 April 11, 2007
3.0 224 225 226 X August 6, 2007 IOS30 v1037 Channels can now display data gathered by WC24 (Weather, News). Clock display. The Wii Message Board button will now flash when a message arrives. You can now rearrange the order of your Wii Friends in the address book, scroll the message text by pressing the B button on the message screen. 224, 225, 226 August 6, 2007
3.1 256 257 258 X October 10, 2007 IOS30 v1039 USB Keyboard support. New version of Internet Channel and Everybody Votes Channel 256, 257, 258 October 9, 2007
3.2 288 289 290 X February 25, 2008 IOS30 v1040 "This update does not affect any prominently-used features or menus; however it does provide some behind the scenes updates that will improve system performance." 288, 289, 290 February 25, 2008
3.3 352 353 354 326 June 17, 2008 IOS30 v2576, IOS40 v2320 First System Menu for Korean Wiis. Korean Wii released on April 26, 2008 so those Wiis were the first to get the 3.3 Menu almost 2 months before the other Wiis. First attempt at blocking Twilight Hack. Shipped with fixed versions of IOS30, BC, MIOS. Nintendo releases the Taiwan Wii on July 2, 2008. Taiwan Wiis use the Japanese System Menu so the first System Menu for the Taiwan Wiis is 3.3J. 352, 353, 354 June 13, 2008
3.4 384 385 386 X November 17, 2008 IOS50 v4889 Second attempt at blocking Twilight Hack. New EULA. Supposedly has speed fixes for DVD and SD access. An enhancement was made to the Wii console's Parental Controls. USB keyboard support with the Mii Channel. 384, 385, 386 November 17, 2008
3.5 X X X 390 March 3, 2009 IOS52 v5661 First update to Korean Wii System Menu, Launches with new Shop and Region Select Channel 390 March 1, 2009
4.0 416 417 418 X March 25, 2009 IOS60 v6174 SDHC support added and possibility to launch channels on an SD card. Also, an update of the Wii Shop Channel to download onto an SD card. A "transfer" button has been added in the Wii console's Data Management menu. Update to block the Twilight Hack. 416, 417, 418 March 24, 2009
4.1 448 449 450 454 July 3, 2009; July 15, 2009, July 30, 2009 IOS60 v6174 Fixes a problem related to the Wii MotionPlus video and the SD Card Menu. 448, 449, 450, 454 July 2, 2009; July 15, 2009, July 30, 2009
4.2 480 481 482 486 September 28, 2009 IOS70 v6687 Intended solely to block hacking/piracy attempts. Among the changes were a fix for Bannerbomb v1, overwriting BootMii (as boot2) with boot2v4, blacklisting the title IDs "HAXX" and "DVDX", and several preventative IOSes (222, 223, 249, 250). Region-free hacks were blocked (now fixed), and Wiis converted to and from the Korean region were bricked with Error 003. 480, 481, 482, 486 September 28, 2009
4.3 512 513 514 518 June 21, 2010 IOS80 v6943 Another exploit-fixing update. Among the changes were a fix for Bannerbomb v2 (visible as Error 004), deleting BootMii (as an IOS), and removing HBC. 4.3 was the last System Menu, 2 years before the Wii U came out. 512, 513, 514, 518 June 21, 2010

Please feel free to add more changelog entries. Some information was taken from Nintendo.

Homebrew Alternatives

With the development of BootMii, the idea of booting straight to Homebrew may soon become a reality. In light of this, there are a couple of projects out there to create a homebrew-friendly System Menu alternative, such as WiiMU.