Prior to updating my nav system with the files from here, I purchased and downloaded the 2013.20 map from the Garmin site. I had to download the Garmin Updater application, which downloads the installation package directly on to a USB thumb drive. The gmapsupp.gma, gmapsupp.unl, and the 0464H4AO.pnx files were part of the package that was downloaded to my USB stick. I took that stick, deleted the .xml and map image files, and copied all the new files into it. Maybe there's a way for you to copy those files from your head unit onto a USB drive? Otherwise, hopefully they're available here on the forum somewhere.
Apparently I left out the InstaSearch (D3157110A.sid) file - I don't know if it's really needed - I'll try to reload it, but I don't think there's any harm in you adding it.
In my statement above where I say I waited forever for the unit to finish reading the USB drive, I meant I was waiting for it to finish and report "no media found" because the update instructions state for one to wait until it's done reading before proceeding to the update process. I'm simply stating there's no need to wait - just insert the USB drive and continue to put the unit in standby and/or to update map.
I have no idea what the Pnx file is, or what Garmin uses it for. It was part of the official Garmin download package when I purchased the 2013.20 map update. I'm not a programmer by any means and I'm just starting to tinker with this system. Hopefully some of the more advanced members can help us out with this inquiry.
I wouldn't mind sharing those missing files, but I have no idea how to upload them. If someone could walk me through it, or would be kind enough to upload them, I can email them to you for upload - just send me a pm with the email address where to send them to you.



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