Fixing "Disabled" or "Unavailable" screens without updating the firmware.
: Improper use can "brick" a device or leave it in a boot loop.
: The device must be put into Device Firmware Update (DFU) mode for the tool to communicate with the hardware.
: Requires specific USB drivers (often USBDK) to ensure the Windows PC can "see" the device while it's in a pwned DFU state.
: It uses a custom ramdisk to boot the device into a state where system files can be modified without a full jailbreak.
Backing up and restoring activation files (Passcode bypass).
: Many "cracked" versions of these tools contain trojans or keyloggers.