Well

In the GarminDevice.xml file from the Garmin folder of your ORIGINAL backup, what does it read for 'xxx' in <SoftwareVersion>xxx</SoftwareVersion>? (You can open the xml file in a web browser or any text editior) - - - The version is 330

The Version 3.40 firmware, where did you find that? Could you give me a link to it please? I'd like to study it. - - - I actually do not remember but you can get it here ([Only registered and activated users can see links. ])
- - - Another thing about updating with Garmin Updater - a co-worker handed me his GPS, (you're so smart now, please update my GSP ), Nuvi C255, software 3, ID 1598 - update to download - installed but no change in software or firmware - but I'm not asking for help with this one

Learned a lot, thank you but as you said - "If it ain't broke, don't fix it" - so I'm going to hand him his GPS back as is, only with a modified keybord