First Back up everything , especially all your contacts, calendar entries, messages and notes. Make sure that there is enough battery charge left in your phone so that your phone does not switch off during the update. For s60 v5 touch phones like 5800, N97, 5230 etc and above , open the dialer and type, *#0000#. There comes up a page listing your phone's details. Now, click options > Check for updates. The update if any will download and install. For All other Nokia phones, dial *#0000#. This will list the Phones current Firmware. If any later version is available, hen you will have to use the phone's Ovi suite or pc suite which to update your firmware.
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