When the phone constantly restarts and fails to load the home screen.
If the first boot takes longer than 20 minutes, the flash may have suffered data corruption. Disconnect the phone, force a hard restart, and run the autoloader executable again.
While not an autoloader itself, is an indispensable tool for BlackBerry firmware management. Available for Windows, Mac OSX, and Linux, Sachesi allows you to:
: The device's LED will typically turn green while the data is being written. Once it hits 100%, the device reboots.