What You Gain (The Developer Payload)

Once the exclusive autoloader is installed, your STJ1001 is no longer a phone; it is a development rig.

Drivers: You must have the BlackBerry Desktop Software or BB10 drivers installed on your PC for the autoloader to recognize the phone in bootrom mode.

Internet Archive: Look for the BlackBerry 10 Autoloaders directory which hosts various OS 10.3 versions for specific model numbers.