The whole procedure you did is correct
The SW.UNL is it in Garmin folder?Coz if you can launch the app before putting it in your phone may be it can be that. Remake it and if garmin doesnt work yet try to reinstall ,may be something went wrong, remember to delete old Garmin folders in your phone before reinstalling and remake the unlock file and to run the sisx on your phone before trying to open garmin app, at the end shutdown and restart.