This article discusses software internally used by Apple.
Acquiring a copy without Apple's consent is illegal and may result in being scammed.
This build is likely based on an internal build of iOS 8.0. It was first found on a iPhone 6 PVT but it may be in use for other devices.
This firmware has the kernel version
Darwin Kernel Version 14.0.0: Tue Aug 19 15:09:27 PDT 2014; root:xnu-2783.1.72~8/DEVELOPMENT_ARM64_T7000.
Once booting up into SwitchBoard.app this build allows you to launch the following applications.