I don't think updating the firmware will solve the problem however if you want to try you can update the firmware by connecting your satnav to the computer and downloading webupdater from
http://www8.garmin.com/support/collection.jsp?product=999-99999-27 When you have it set up it will automatically check for the latest version of software for your satnav. I don't think that will solve your problem though. The satnav will only show road names that are on the map.
Before trying to update the software try this solution first. On the satnav press Tools, then Settings, then Map. Under Map Detail press whatever it says and you'll get a list of options. Press Most. This will show the most map details and will show any roadnames that are on the map.
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