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'''boot2''' is the Wii's third-stage bootloader; it is stored in the [[BroadOn]] WAD format, which includes a ticket that is encrypted with the common key and signed.

'''boot2''' is the Wii's third-stage bootloader; it is stored in the [[BroadOn]] WAD format, which includes a ticket that is encrypted with the common key and signed.

Boot2 versions 1 through 4 are known to exist. 1 is only seen on prerelease consoles including those with the [[Startup Disc Menu]] installed, 2 is seen on earlier units, 3 came preinstalled on some newer systems, and 4 was deployed to all Wiis with a system menu update.

boot2 versions 1 through 4 are known to exist. 1 is only seen on prerelease consoles including those with the [[Startup Disc Menu]] installed, 2 is seen on earlier units, 3 came preinstalled on some newer systems, and 4 was deployed to all Wiis with a system menu update.

== Boot2 update controversy ==

== boot2 update controversy ==

Upon the release of the 4.2 System Menu update, which is believed to be the first time that a boot2 update was deployed to existing systems, it was discovered that a flaw in the [[ES]]_ImportBoot function used to update boot2 lead to the bricking of consoles which were installing the update.

Upon the release of the 4.2 System Menu update, which is believed to be the first time that a boot2 update was deployed to existing systems, it was discovered that a flaw in the [[ES]]_ImportBoot function used to update boot2 lead to the bricking of consoles which were installing the update.