This leak of OS 10.2.0.1521 is a full OS. It comes with the radio file, and should work without any major hitches. As always, if you really depend on your phone to work perfectly, loading a leaked OS may not be the best idea. However, if you want to give it a shot, hit the download link below!
Also, keep in mind this OS will only work on the STL100-1 Z10 model, so if you have any other BlackBerry 10 device, do not attempt to load this OS.
Warning: Please remember that this IS NOT an official release operating system. If you wish to install this OS keep in mind that this may cause your BlackBerry to not function correctly. Also remember, upon loading this OS, it will wipe your device clean. Make sure you back up your device before loading it. Otherwise, you will lose all your data.