When using the new LEX_PKG folder plus .unl file (either D046800.unl or gmapsupp.unl) in the Garmin folder on an SD to install on the nüvi 350, I get following error message:
(unlock code based on card-ID!)

filecopyerrorpleaserein

When I place the LEX_PKG folder and .unl file (either D046800.unl or gmapsupp.unl) in the Garmin folder on the unit itself, I get the following error message:
(unlock code based on unit-ID!)

installationerrorplease

After I remove the LEX_PKG folder and .unl file from the Garmin folder on the unit, I still get the same error message...