Blackberry OS 4.5 Carrier download links.
2. Download the above file to the PC then install it to the PC by running (double clicking) the OS file you downloaded.
3. Locate the vendor.xml file and delete it. It's located in c:\program files\common files\research in motion\apploader
4. Plug in BB and Open Desktop Manager. You should be prompted to upgrade.
The process takes about 45 minutes to an hour depending on how much data you have to backup and restore during the process. Once it's done loading the new OS it will reboot (it may do this twice during the entire process.) You will see a white screen with an hourglass for up to 20 minutes at a time while the DM says "waiting for initialization."
This one is only 18.104.22.168 where as others use 22.214.171.124. If you are loading the software onto another carriers device, I would pick one of the other downloads.
This one is 126.96.36.199 so again, I would go with another unless this is your carrier.
(Rogers uses 188.8.131.52
This is the first of the big U.S. carriers to offer it.
It is the 184.108.40.206 version. You must have a T-Mobile phone number to download the software for this one as well.
this is the instructions for the download...
then is directs you to the blackberry site via a link.
As of right now, they have it for the 8820 and 8320.