View source for Stub IOS

A '''Stub IOS''' is an [[IOS]] that serves no purpose other than a placeholder. They are released to overwrite other IOSes, either to overwrite a [[cIOS]] in a specific slot and break homebrew, or to remove an unused IOS, freeing up space and removing the need to maintain the unused branch as new exploits are found.

Stub IOSes generally have 3 contents: a 0x40 byte build tag, and two shared contents, which depend on the variant. The first shared content generally contains [[ES]], while the second contains FFSP and the kernel (including [[IOSP]]).

== 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]], and the [[IOS3]] stub that was never released on [[NUS]].

The 2008 variant was based on [[IOS51]], although the IOS51 stub was not of this variant.

=== 4.0 variant ===
The [[4.0]] variant came in two batches and was based on [[IOS61]].

The first batch had size 245760 and was built by <code>kenshu@MAENORYU</code>; it was used by [[IOS16]] and [[IOS40]]. The second batch had size 229376 and was built by <code>@SAITOT</code>; it was used by [[IOS50]] and IOS51.

=== 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>. It is based on the functional version of IOS60.

Interestingly, [[IOS222]] and [[IOS223]] have the same build tag, and [[IOS249]] and [[IOS250]] have the same build tag (different from IOS222 and IOS223).

In addition to the 4.2 stubs, [[IOS52]] (stubbed in [[4.1rev02K]]) is of this variant.

=== 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> and is based on the functional version of IOS70.

=== 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> and based on [[IOS80]].

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[[Category:IOS]]