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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 0 through 5 are known to exist. 0 is used at the factory to install the first few titles, 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, 4 was deployed to all Wiis with a system menu update and preinstalled on some systems before the update, 5 was distributed on the Wii mini and some newer RVL-101 systems.
==boot2 update controversy==
==boot2 update controversy==
This boot2 uses version number 0, while the earliest 'normal' boot2 has version number 1.
This boot2 uses version number 0, while the earliest 'normal' boot2 has version number 1.
==nandboot==
nandboot is a special boot2 build which seems to have been used only for testing. When executed, it loads executable data placed at NAND pages 0x80-0xAF and jumps straight to it. This happens without any security check, so it can be used to run unsigned code (such as BootMii) just like with sd_boot. The advantage of executing code with nandboot is that no SD/SDHC card is needed, which makes it suitable for the [[Wii Mini]].
This boot2 also uses version number 0. In order to install this boot2, zeroing out the boot2 version in the SEEPROM is needed.
{{Template:WiiNavbox}}
{{Template:WiiNavbox}}