This article discusses software internally used by Apple.
Acquiring a copy without Apple's consent is illegal and may result in being scammed.
A dump of this build's root filesystem is known to exist and is almost 2.0 GB in size. It was discovered on a prototype iPad 2, and is based off of an internal version of iOS 4.3.
This build seemingly has the same set of apps as Durango 8F3178a. Strangely, the regular iOS Camera app is included, although it likely cannot be launched.
The following is a complete list of SwitchBoard apps present in this build: