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Apex 8A133
Background
This is an early build of iOS 4.0 that was on the famous Deathstar iPhone prototype. It can be seen in action here, with a custom backplate and running this firmware, 8A133. Notably, it contains files referencing an unreleased device bearing the codename - N89. It also has a variety of diagnostic images, including one for the iPod touch (3rd generation). The root filesystem is known to be somewhat larger than 500MB.
This build is known to contain kernels for the Apple A4 processor, as well as those found in the iPhone 3GS, iPhone 3G / original iPhone, iPod Touch (Second and Third generation). Interestingly, it also contains kernels for an unused processor - the MV88F6281, an ARMv5 compatible processor, with the custom Sheeva core at its heart. It is speculated that this processor could have something to do with the unreleased N89 prototype.
GrapeCal is the only application that differs from other firmwares, in that it contains a startup screen with a slider that is similar to those found in Reliability. It is simply labeled, "Drag for Main Menu."
Applications
Upon booting up, SwitchBoard.app lets you choose from the following:
