You can always find the latest version of 9100/9105 software at this link. It is always updated, see the top most threads at the top of the section...
http://www.blackberryforums.com/general-9100-serie
Device operating system releases are "released" by specific carriers once they have certified and trained their support techs, but still, you are able to load to any carrier's same model by following the instructions below. There is NO difference between operating systems of the same release version regardless of the carrier it comes from. The only difference might be the languages and/or carrier branded themes included.
Some users might worry they will void their device warranty by loading an OS from another carrier. There is really nothing to worry about. Please read more information on that here:
http://www.port3101.org/power-users/296-blackberry
1. If any post helps you please click the 
2. Please resolve your thread by marking the post "Solution?" which solved it for you!
3. Install free BlackBerry Protect today for backups of contacts and data.
Re: How to tell what's the latest OS 6 for BlackBerry
BBPearl3G- wrote:
I recently came upon the sticky that tells about all OS downloads for BB Pearls. I have a 9100 version, and I want to install OS 6 on it.
1 - Does it matter what firmware I download? For 9100 versions or 9105?
hello,
as indicated in the sticky post, each firmware for Pearl 3G work identically for 9100 and 9105. It's the line that says:
"The OS installer is the same for both the 9100 and the 9105."
BBPearl3G- wrote:
2 - How can I tell what is the latest firmware?
What should I be looking at for the firmware version? Applications, or Software Platform?
In this case, should it be Applications 5.0.0.884 and Software platform 6.2.0.94 that gives me an OS 6 or an Applications of 6.00.380 and Software Platform 6.6.0.85?
usually all three numbers grow at the same pace. So between two releases, comparing the firmware version, the application version, or the software platform is the same at 99% of the time.
But on the Blogosphere everybody talks of the Application version. That is the reason why it is colored in green in the sticky post.
The search box on top-right of this page is your true friend, and the public Knowledge Base too:
