When you load an , you are booting the iPhone or iPad into a custom environment where an SSH (Secure Shell) server is automatically started. This allows a technician to connect to the device via a terminal (using credentials like root and alpine ) to execute low-level commands.
The .jar (Java Archive) version typically refers to cross-platform GUI/CLI tools like , SSH-Ramdisk-Tool , or Legacy iOS Kit components. ssh ramdisk tool.jar download