First things first. If you have a PC-Suite software for your mobile, look for a firmware upgrade option in it. Nokia phones generally have a separate software package for updating their mobiles. I've checked the samsung site and the support column for your mobile and found no separate software or ways to upgrade your device's firmware. IT IS ADVISABLE TO UPGRADE YOUR FIRMWARE THROUGH OFFICIAL SOURCES ONLY. Should your phone have any problems, the company will definitely release an upgrade.

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Keep checking this page for that:; But if you are ready to 'risk your warranty' and go for an upgrade, check this 2 pages.