How do I upload a file to my GPS (garmin c340)?

I purchased a preloaded garmin c340, and now I have a file I downloaded off the web (gpx file), with all the red light cameras and such, and a different splash screen as well, but my gps did not come with MapSource, the software that is used for that because it says it doesn’t need it since it is preloaded. I tried to download it from Garmin, but they only relese the “upgrade”, so it does not work.
Does anyone know how to upload these files? Even if it is not with MapSource?

Thanks!

Answers below in Comments Section

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One Response to “How do I upload a file to my GPS (garmin c340)?”

  1. Comment by gpsdude

    use the poi loader software available at garmin.com. and do not ask the same question so many times????