PM sent, but won't you just have to do it all again after the firmware update?
Do you know that you can now do the update online at Nokia.com? I'm not sure it can be done for all networks, mine is Orange and it was fine. Don't know about the others.
You may also need another file to get full postcode support. There should be a folder called zip on the memory card, if there's not you'll need to find that too.