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6 variants i found
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Most stub IOSes are version 65280; this is version 255.0. Most homebrew IOSes use version 65535 (255.255) to prevent Nintendo from updating them.
Most stub IOSes are version 65280; this is version 255.0. Most homebrew IOSes use version 65535 (255.255) to prevent Nintendo from updating them.
−Stub IOSes generally have 3 contents: a 0x40 byte header content, and 2 shared contents that vary between IOSes. The selection and purpose of these shared contents is unknown.
+Stub IOSes generally have 3 contents: a 0x40 byte build tag, and two shared contents, which depend on the variant.
+== Variants ==
+There are several variants of stub IOSes.
+=== 2008 variant ===
+The first stub IOSes were released in [[3.3rev03]] to [[IOS4]], [[IOS10]], [[IOS11]] and [[IOS20]], with a size of 245760. They were built by someone named <code>yasuh-to@TONKAT</code>. This variant was also used for the [[IOS30]] stub distributed in [[3.4]].
+=== IOS16 ===
+For unknown reasons, [[IOS16]] is its own type of stub, also having a size of 245760. It was built by <code>kenshu@MAENORYU</code>.
+=== 4.0 variant ===
+The [[4.0]] variant has a size of 229376, and was built by <code>@SAITOT</code>.
+=== 4.2 variant ===
+The [[4.2]] stubs, including both [[IOS60]] and the [[cIOS]] stubs, also have a size of 229376 just like the 4.0 variant, but were built by <code>kenshu@MAENORYU</code>. The second content is identical to that in the 4.0 variant, but the third content is different.
+Interestingly, [[IOS222]] and [[IOS223]] have the same build tag, and [[IOS249]] and [[IOS250]] have the same build tag (different from IOS222 and IOS223).
+=== IOS70 ===
+[[IOS70]] has size 245760, but has nothing in common with the 2008 variant of stub IOSes. It was built by <code>saito_tomoya@IR</code>.
+=== IOS254 ===
+[[IOS254]] also has size 245760, but it has nothing common with IOS70 or the 2008 stubs. It was built by <code>tokunaga_yasuhi</code>.
{{Navbox IOS|skipCat=true}}
{{Navbox IOS|skipCat=true}}
[[Category:IOS]]
[[Category:IOS]]