[mkgmap-dev] Etrex 20 Firmware version 4.80 does not work with mkgmaps.

Sun Nov 18 16:14:46 GMT 2018

On Fri, Nov 16, 2018 at 05:48:43PM +0100, Felix Hartmann wrote:
> Can you not downgrade the firmware?

Yes. Fortunately, Garmin do allow that. When the unit prompts for you
to confirm that you really do want an older version, it takes a minute
or two before it responds and accepts the answer. I thought at first
that it was stopping me making that selection - very worrying - but
eventaully it responded and went ahead.

So an update. Firmware version 4.80 really does not seem to work with
the OSM map generated by mkgmap. I tried many things including a full
factory reset.

Reverting to firmware version 4.70, and the map is back.

Sorry that I can't throw any more light on the matter. As I said my
contour maps (which I thought were generated also by mkgmap) *did*
work. And as I also said, the Garmin showed the map and allowed it
to be Enabled/Disabled, but otherwise did not seem to work.

ael