BridgeOS

bridgeOS is a heavily modified variant of watchOS that runs on integrated iBridge devices.

There are currently only two known versions; 2.0.1, which has a build number of 15P2542 and the codename LoboDeerHWBridge, and 2.3.1, which has a build number of 15P5064 and the codename LoboFoxBridge. Both of these are for the iMac Pro's iBridge processor.