The lonely 4G-Less sibling of the BlackBerry Z10 just got a nice OS leak. The last OS leaks were only for the 4G Qualcomm Snapdragon powered STL100-2, STL100-3, & STL100-4. Now the BlackBerry Z10 STL100-1 also has a new 10.1 os in the form of 10.1.0.1609 thanks to BerryVerse. The original file link seems to be down but Peter let us know about this mirror he found on CB forums by Stitch69 though you will have to UnRAR it with a program like 7Zip.
Download OS 10.1.0.1609 at your own RISK!