Checked your links out, the Firmware Update for GTMxx Traffic Receiver is actually only a change log Garmin page.
If you click on View System Requirements, nothing happens and there is no file to download.
I downloaded the 32KB RGN file you provided but how do you load it into the Nuvi?
Webupdater does not work, I also tried the Firmware Flasher (Updater.exe) program I have to load the file, that too does not work.
Is this file for all Garmin Traffic Receivers or specific models?
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