boot2

boot2 is the Wii's third-stage bootloader. It is responsible for loading the System Menu TMD and loading the appropriate IOS.

Version history

Version Description
v1 Present on Prelaunch consoles.
v2 Present on launch-day Wii's.
v3
v4 Packaged in the 4.2 update to erase BootMii as boot2.
v5 Only found on Arabian Wiis, certain RVL-101 Wiis and the Wii Mini.