I don't know if anyone else has had the problem where you get the "unable to authenticate maps etc" message when loading but the latest Firmware update to 5.9 seems to have fixed the issue.
There seems to be a million work arounds with keygens and the like but this is by far the simplest way to do it:
GCD Update Procedure
Use the links in Firmware History to download the zipped file for the version you desire
Unzip the downloaded archive and extract the gcd file
Rename the gcd file to gupdate.gcd
Connect the Montana to your computer and enter USB Mass Storage Mode
Copy the gupdate.gcd file to [Montana]\Garmin\gupdate.gcd
Disconnect and reboot the Montana
Once the update is completed, the GPSr will delete the gupdate.gcd file
Credit tofor the instructionsCode:Please Login or Register to see the links
So far no other stability issues so only time will tell.
Last edited by catymag; 19th June 2014 at 04:02 PM.
Montana software 5.60 was buggy, news here
[Only registered and activated users can see links. ]
Oregon 600 had the same, then fixed.
[Only registered and activated users can see links. ] post 127 and following.
Some devices got bricked too with these firmware. Both (Montana and O600 sw have been withdraw from Garmin server after few days)
Be careful to reverse to buggy previous firmware.Montana (WebUpdater) software version 5.60 (withdrawn by Garmin on Feb 3
Newer Montana and O600 firmware don't have protection, so we don't need any workaround actually.
You have to navigate to get to the good.
[Only registered and activated users can see links. ] Password for my files: gpspower.net
Please don't flood my pm box with questions you can post on forum!! You won't hear back from me.
Galaxy S5 Kitkat 4.4.2 / Nuvi1200->1250 / Nuvi3790T->34xx / Nuvi 2200 / Nuvi 66 / Oregon 600