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Update partition info
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The '''Wii Backup Disc''' is a service disc apparently used inside Official Nintendo Repair shops to transfer personal data like savegames and console settings between Wiis as part of a repair. It was the only known official application to use [[IOS16]], and it is unknown what happened after IOS16 was stubbed.
+The '''Wii Backup Disc''' is a service disc apparently used inside Official Nintendo Repair shops to transfer personal data like savegames and console settings between Wiis as part of a repair.
It appears to allow [[ticket]] files and save files to be dumped and packaged as [[RBK]] files, and RBK files to be installed. The actual RBK format is unknown, but presumably it included these.
It appears to allow [[ticket]] files and save files to be dumped and packaged as [[RBK]] files, and RBK files to be installed. The actual RBK format is unknown, but presumably it included these.
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The "DevCerts" are two [[WAD]] files on the disc FS called "dummy-cls.wad" and "dummy-loc.wad," both of which have one content which is 0x40 bytes. One is empty the other one seems to be just random data, possibly a build tag. The "dummy-loc.wad" file also has a [[certificate chain]] including the debug certificates. "dummy-cls.wad" has a ticket which the Wii does not accept, therefore it cannot be installed.
The "DevCerts" are two [[WAD]] files on the disc FS called "dummy-cls.wad" and "dummy-loc.wad," both of which have one content which is 0x40 bytes. One is empty the other one seems to be just random data, possibly a build tag. The "dummy-loc.wad" file also has a [[certificate chain]] including the debug certificates. "dummy-cls.wad" has a ticket which the Wii does not accept, therefore it cannot be installed.
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+== Update partition ==
+The Wii Backup Disc was the only known official application to use [[IOS16]]. Because IOS16 is signed by Nintendo, and the update partition of the disc only has IOS16 and [[boot2v2]], homebrew install discs were released that used IOS16 and had a copy of the Wii Backup Disc's update partition.
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+When [[RVL-CPU-20]] consoles were released, IOS16 became one of the only IOSes that could be downgraded without issues, which resulted in general homebrew also installing IOS16 to get access to the [[signing bug]] and patch other IOSes.
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+Nintendo responded in the [[4.0]] update by releasing a stubbed [[IOS16]] (v512). It is unknown how the Wii Backup Disc worked after this point, although there may have been a new IOS16 released that is v513.
== Screenshots ==
== Screenshots ==