DCSD Cable for iPhone Restore and Service

DCSD Cable for iPhone Restore and Service

Uses:

Verbose Boot: One use of the cable was to view verbose boot. You could access this by setting debug uarts in iRecovery or nvram, however, since iOS 9, this output has been obfuscated.

Shell over serial: Using qwertyoruiopz's serialsh, it is possible to get shell over serial. This is useful, because it does not require any additional daemons other than those shipped with iOS. An example use case for this would be protecting against bootloops.

Debugging the kernel: Using the DCSD cable, it is possible to attach GDB to the iOS kernel, and pause it's running.