Either visit a Nokia Service Centre or a Carfone Warehouse for your firmware to be updated.
You can find out if a newer version is available by making a fone call to them or drop in. Please be advised not all Carfone Warehouse shops have repair shops in them.
To find out the current version on your fone type in
*#0000#
You could always check the software update link on this site to see if the new suite has you make of model on it to perform a do it yourself update.
Remember to back up all your downloaded content as the firmware operation will delete this.
Firmware is their to help cure bugs and add enhancements to your fone so ask before they do this what the new firmware will add to your handset. Some times it just makes it run a little faster. Its the old saying, why fix something thats not broken.
But in the end its your choice.
Nokia n8.
iphone 4 16gb - black
Be happy !!