by kolokythas » Wed Mar 29, 2017 4:29 pm
In order to be absolutely sure you may keep the original firmware by copied it somewhere and reinstall it at any time later on again on your device. Also at any moment if you do re-update of a new firmware with Garmin Express again it will be locked.
But as much that i know this patching does not affect to the re-update of a Life Map this should be related with the device number somehow i suppose.