How to install a new BlackBerry Operating System (OS) or upgrade your current one on PC
Today’s How to belongs to How to install a new OS or upgrade your current one of your BlackBerry devices.
1) Download a new OS for your BlackBerry Smartphone

The first thing to do is to download a new BlackBerry OS and save it on your Desktop. In order to see what version you currently running head over to the Options icon on your home screen and press the About link. The version of your OS is determined by a series of numbers starting with V and follow by a number.
Another quick shortcut to do this is pressing Alt, Shift and the letter H on your keyboard.
How to release your BlackBerry Pin
This tutorial shows you how to release your BlackBerry Pin number.
Basically any carrier can do this for you, this tutorial is for you to do it by yourself without needing to call customer service and wait for them to do.
Please proceed at your own risk.
Let’s say your carrier is ATT&T. In order for this to work you will need another account (anyone’s account) for it to work. Let’s call your PIN X and the other account’s PIN Y.
Pin X – Your Current Account
Pin Y – Other Account You’re Using
Step 1
Sign in to your AT&T Internet Service Manager, in this case located at http://bis.na.blackberry.com/html?brand=mycingular using your PIN Y account. At the top left hand side you will notice a Change Device link. Select it and enter your PIN X (Current PIN) At the IMEI/ESN/MEID field and click SAVE.