From The Apple Wiki
Original author(s)Apple Inc.
Developer(s)Apple Inc.
Stable release
(latest known version)
Operating systemmacOS
Size1,863,467 bytes [APP] (59.2.14)
Available inEnglish
TypeDevice activation
LicenseClosed source

"PurpleFAT" is an Apple Factory Activation tool, assumed to be used in factories for UUT's (units under test). If the unactivated device is plugged into a computer and the software is run, it searches for the device and would activate it (Seems not to work and just plays a sound saying "Oh nooh!") PurpleFAT needs an activation sever. https://albert.apple.com/WebObjects/ALUnbrick.woa/wa/deviceActivation does not work.

Application can be locked for some security reasons, and requires a passcode when unlocking the interface (This passcode is stored in a string, when dissasembled can be found at __text:00003089)

Log (No server)

2013/01/17 20:19:29  Attached device "SERIALNUMBER" does not have an IMEI.
2013/01/17 20:19:29  No servers specified!