Today we have heard that OS 18.104.22.1687 has leaked for the Sprint BlackBerry Curve 8350i, chances are it is a relatively small update, however may perhaps patch up a few security vulnerabilities.
No official changelog has been revealed, however I am sure there are plenty of bug fixes and interface tweaks, you can download this OS version here.
As we always say, ensure you back up all important data beforehand, also make sure you have plenty of battery life.
Have you installed this OS version on your BlackBerry? If so, did it go smoothly? Are there any noticeable changes?