how to update ur blackberry OS on ur own

-make sure you have blackberry desktop manager (the latest if possible)
-u can download the os from RIM website!!
-install it on ur system like every other program!!
-plug your fone on ur pc
-this is the tricky part. there is a file that you have to delete so that your desktop manager will not have to go online to look for the os n start downloading it (kind of online upgrade which NEPA will not allow.)
-and once the desktop manager detects the new os on the pc it will start installing almost immediately!!!
 Offline Upgrade

You need some software related. I usually use BlackBerry Desktop Software, BBHybrids Tool, and BlackBerry OS (Operating System).



-BlackBerry Desktop Software (use the latest)http://us.blackberry.com/apps-software/desktop/desktop_pc.jsp

-BBHybrids Tool  http://vmancer.com/shrink-a-os-blackberry-os-bbhybrids-tool/

-BlackBerry OS http://www.vodafone.de/business/blackberry-support/blackberry-curve-9300.html 
 
 Step by step

-Install the BlackBerry Desktop Software and BlackBerry OS (BlackBerry Device Software).
-In directory C:\Program Files\Common Files\Research In Motion\Shared\Loader Files\9300AllLang_v6.0.0.448_P6.6.0.124\Java, delete file vendor.xml. The directory is hidden by default. You have to bring it through Folder Options (first image below).
-Run BBHybrids Tool and do Wipe Device, then close the software (second image below).
-Run BlackBerry Desktop Software then will be detected there is no OS on your BlackBerry. It would offer to do the OS installation process (first right image below).

Process will run automatically like on online update process. Allowed if there is request to create backup (backup should be made prior to this process).





Note:
-Consider whether to upgrade your BlackBerry OS. Maybe you did not get improved performance, but on the contrary.
-This article based on my experience, may vary from that written on a blog or another website. I was confused because it differs from the article ever read.
-I am not the expert on this, maybe I forgot to write one or two steps.
-Do not ever interrupt the upgrade process because it can damage the hardware. Damage can also occur due to unintentional, such as power failure, lost internet connection, and others.