Updating a blackberry pearl
You can install the OS issue by other carriers or a leaked OS, but with the latest DM, RIM has blocked that feature.
So even if you have installed the OS update, DM will not detect it.
Take out the battery and connect the Black Berry via USB.
The first thing is that there are two different types of OS that you can install: one is the official OS, released by a carrier, and the other one is a leaked OS, meaning that it has not been approved by the carriers to be installed.
You can install an official OS using Desktop Manager, but usually it will not let you install a leaked OS unless you do some tweaking.
Never unplug the Black Berry while the device is upgrading. If you do, there are ways to get it working again, but it’s troublesome.
Official OS from other Carriers and Leaked OS: Why is DM not detecting the update after installing on PC?