Well, first off...the 8520 is not a Storm, it's a Curve. The 9520 (which you put in your profile here) is a Storm.
So, if your question is about the 9520, then the answer is never. The Storm line is EOL, and as far as I understand, development stopped on the OS in the 5.0 range, and will never move beyond.
Occam's Razor nearly always applies when troubleshooting technology issues!
If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.