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[mkgmap-dev] Routing on Etrek 20: firmware 4.30 and URI

From ael law_ence.dev at ntlworld.com on Mon Aug 22 13:03:11 BST 2016

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


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


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