This article discusses software internally used by Apple.
Acquiring a copy without Apple's consent is illegal and may result in being scammed.
A 3.1.x based firmware used for testing devices. Found on an iPhone 3GS.
After booting up, SwitchBoard.app screen shows up allowing you to choose different options.
They consist of:
Soundwave crashes SwitchBoard.
The firmware includes standard set of UNIX binaries. apt-get is present, suggesting that there is an internal APT repository.