When the prompt says "Connecting to Bootrom," connect your Z10 to the PC via a high-quality USB cable.
An Autoloader is a standalone executable file used to wipe and reinstall the operating system on a BlackBerry 10 device. Unlike an Over-The-Air (OTA) update, which patches existing software, an Autoloader writes the OS directly to the device memory. blackberry z10 stl1003 autoloader 1033 download high quality