UK T-Mobile Unlocked N70

Hi

I have N70 originally locked to UK T-Mobile network. I paid T-Mobile for
unlock code and it now works with all networks. The current software
version is V 5.0609.2.0.1. I would like to upgrade to latest version, but
Nokia Software Updater says I have the latest version available, when I know
a later version is available. I've seen posts in this group or another
where it's possible to change model id of phone to enable a more recent
update to be installed.

Can anybody point me in the right direction.

Many thanks

enquirer