Official link download autoloader 10.3.3. - CrackBerry Forums
The firmware (specifically build 10.3.3.498 or newer) is the final major operating system version for the Z10. This guide explains how to find and use the autoloader for the STL100-2 variant. Important Prerequisites Blackberry Z10 Stl100-2 Autoloader 10.3.3 Download
Once you install OS 10.3.2 or 10.3.3, you cannot downgrade to earlier versions due to anti-theft protection. Official link download autoloader 10