Neil, I bought my 3490 brand new from our local electronic store back in 2012 and it have never been modded before. Everything on it is all stock, untouched, besides the regular Garmin software updates. The ecoRoute HD must be enabled by default for the US. With that being said, are the instruction you posted the only way to enabled/disabled those features? Or is there another way? I'm just asking because I'm new to the modding GPS stuff. If this is the only way to enabled/disabled features, does it matter what software version my 3490 have? My 3490 software version is on the latest 8.20. Also, I have just finish reading the instructions from the "New and Easy Procedure" and I have quite a few questions to ask, they are;

1) The "Garmin update files" download have expired, where's the new file download?
2) It says "Firmware" required, what firmware? I click on it and it takes me to the "Garmin Receivers Firmwares" forum?
3) It says "Open RGN_Tool --> drag nuvi34xx_GCDFile__710.gcd to RGN_Tool" but I'm on software version 8.20, does it matter?

I have a ton of questions to ask but I'll stop for now since the above questions seems to be the most important to me at the moment. Let me know if I should continue asking questions here or move over to the "2xxx and 3xxx series enabled features" thread. Thanks guy, I'm still trying to learn