In the BlackBerry 10 ecosystem, the is not an OTA update. It is a raw, surgical instrument. It is a self-contained .exe or .bin script that speaks directly to the Qualcomm/Omap boot chain over USB DFU (Device Firmware Upgrade) .
The STJ100-1 variant is particularly special because it lacks the carrier locks of the STJ100-2 or STL100-x series. It is unshackled . blackberry z3 stj100-1 autoloader developer
The specific STJ100-1 Autoloader file (usually an .exe format). A high-quality Micro-USB cable. In the BlackBerry 10 ecosystem, the is not an OTA update