Originally Posted by GARainman
As near as I can tell - this DOES NOT WORK for a newer (2015) 430N. I tried all the steps, but never could get the Garmin firmware to downgrade from 5.11. The radio downgraded - but not the Garmin firmware. If someone has successfully done this on a newer 430N - please - I'd love to be proved wrong.
The 2013+ 430N radios are different (unfortunately).
There were some 2011 radios that could not be updated at all...
Then there are some 2011-2012 radios that can be updated. Those radios the Garmin software updates to v3.
The 2013+ radios the Garmin software updates to v5.11.
My understanding is that the maps can be updated, but the maps must be added as 'supplemental' maps in the system.
I really wish I could help you but I've got a 2012 430N.
It's so frustrating that car manufacturers make it so difficult for consumers.
I work in the Information Technology field and years ago after seeing what the big names (Dell, HP, etc) do to lock you into their workstation platforms I stopped buying their desktops and I build my own so that I can easily upgrade when I want to.