On Sun, Aug 21, 2016 at 01:06:43PM -0700, Bill wrote:
Try running a zip program on the non gcd file. (I normally use 7z, but I assume other will work as well)
Garmin (http://www8.garmin.com/support/download_details.jsp?id=5553) only provide direct access to Garmin Express these days. Running 7z on GarminExpressInstaller.exe does unpack many files but nothing that looks like the firmware image. That fits with the description of Garmin Express that seems to search for the latest firware, presumably using the missing URIs perhaps to a ftp server.
You may be able to locate firmware for your unit at www.gawisp.com/perry/agree.html. Thanks again for the suggestion. Unfortunately that is just an archive of the dumbed down Webupdaters (which assumes particular operating systems) rather than copies of the real GUPDATE.GCD firmware images.
I looked again at www.gawisp.com/perry/agree.html and saw that the *.gcd files were there after all. My apologies. The file with the latest time stamp there is eTrex20x_30x_Webupdater__230.gcd. So it is not obvious which firmware version that represents. It does not seem to be 4.30: perhaps it really is 2.30? I have a copy of the 4.30 GUPDATE.GCD which is 9467284 bytes long and has a sha512 checksum of 1dd7262da8566a153a40bb65fc36238069253afc0b7a0a670733633df1d6864864198a5d6e1b09e37b4606725752ce523e03da2893d45ee5a442d308a0d4b2bb I downloaded that from http://download.garmin.com/software/eTrex20_30_Webupdater__430.gcd which is still there and seems to be the current "missing" URI. It seems probable that future firmware versions will follow the same pattern. ael