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You can check for available software updates for your phone and download them. Follow these instructions to update your phone's software.
Before updating your phone's software, it's recommended that you back up the phone memory. Click here for information on how to back up the phone memory.
Find the download section on the web page to download Zune.
Download and install Zune on your computer.
Connect phone and computer
Update the phone software
Select SETTINGS at the top of the display.
Follow the instructions on the display to update your phone's software.