you cannot update firmware of any nokia phones on your own.
YOu will need to take it to the nokia galary o do the same. And not all nokia galaries in India are equipped with the flashing instruments.
I got my QD firmware updated last year once. took them 4 days to do that.
And there are 4-5 different firmwares available for QD. Some are region specific. And unless your phone is one of the first lot which had hang problem then dont bother about the firmware upgrade. There is nothing new with any firmware.