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GPSMAP 430/430s/430x/430sx

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  • GPSMAP 430/430s/430x/430sx

    Does anyone here know how to do this? I had 4.50 on it before and update it to 5.50 and lost my dual frequency sonar. Garmin rep said the 430s was not 'optimized' for this even though it came with the dual freq and dual beam transducer.
    Just trying to update it with the <5.50 firmware will do nothing. Any help would be appreciated

  • #2
    Re: trying to downgrade firmware on gpsmap 430s

    found the solution.

    hold the up key while powering on
    when the software loader is ready, hit select twice.

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    • #3
      Re: trying to downgrade firmware on gpsmap 430s

      Hi, I cannot figure out how to start a new thread so sorry if this is in the wrong place. I have a GPSMAP 430sx and cannot get it to power on when connected to the USB on my computer. I want to download the waypoints to my computer and upload others from mapsource. am I doing something wrong or do I need a different cable to connect to my computer? thanks

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