Impossible to program a router.

"Program a Path-route" i mean something to follow during an Activity. I think that Garmin product sucks: in Italy the assistance Is ridicoulos, the devices are constantly with some bug and if the doesn't have sure they works bad. Would have back my Money but It Is impossible.

Instructions for sending a Course to the watch can be found here: Steps to Send a Course to a Device Using the Garmin Connect App | Garmin Support. Make sure you look for the course in the right activity type. For example a cycling course will be available in cycling activities, but not in running or walking activity profiles. Verify what type you selected when you created the course.

Thanks but wasn't my First Time. Already done It a few days ago with komoot, but in past also with connect and Explore. The course(thanks for the correct Word). The course made with komoot two days ago was ok until two hours ago the Watch can recognize Just old courses but not that One form komoot and the two made today with connect.

If you want to translate...

Credo che chiederò rimborso ad Amazon.  

Non legge file gpx, per cancellarli devo spegnere e riaccendere il dispositivo, per cancellare un file! Due settimane fa non funzionava il barometro...sempre problemi e costa più di quello che vale.

Not sure I understand, but if you have problems uploading new courses, that worked earlier, then make sure you did not exceed the maximal number of courses on the watch (30 in case of Instinct). Delete old courses when you need uploading new ones, and the limit is already reached. Easier done on a computer over the USB cable directly on the storage of the watch - they are in the folder //GARMIN/Courses/

File Limitations of the Instinct Series | Garmin Customer Support

If you are unsatisfied, and prefer having the watch refunded just go ahead. We are users here, just like you, and frankly told, we do not really care We are just trying to help a fellow user, and whether you plan to return the watch or not, makes no difference to us. 

I have Just 5 courses.