2012-04-04 11:59 - last edited on 2012-04-04 12:25 by Kosh
use Nokia suite: http://www.nokia.com/gb-en/support/product/nokia-s
You can use the sofware update application which is inbuilt in your mobile. In that case ,your phone memory data will not be lost. U can also do this by typing *#0000# and then Options>Check for update
However, you can also use Ovi Suite to update software, however, in this case , take a backup as phone memory contents will be lost. You have to restore contents again, and then you will be good to go.
Hope this solves your query.