[nogood]

hab auch die 920xt seit ca. 2 Jahren nie Probleme gehabt.

Zu deinem Problem:

In a Garmin 920XT emergency you might want to try to restart a deadish unit with the following:

a. Hold POWER BUTTON on for 15 seconds. The device should hopefully start to turn off.
b. Press and hold UP ARROW BUTTON and DOWN ARROW BUTTON
c. Press but don’t hold the POWER BUTTON for a second or so – device should turn on
d. Wait for 1st beep then release UP ARROW BUTTON
e. Wait for 2nd beep then release DOWN ARROW BUTTON

and/or fiddle with combinations of the above

There is more info in the manual: search for ‘factory’ in the manual

https://the5krunner.files.wordpress....20xt_om_en.pdf

irgend wie sowas. Das gibt es glaube ich auch mehrere Tastenkombis etc. müßtest Du googlen.