fenix 5X frozen > Garmin triangle

Hello,

got my 5X yesterday evening. Was very exited. Set it up, connected to mobile app, connected to Express, installed all updates and went to bed. When I woke up this morning the 5X was only showing the Garmin triangle. I can turn it of, but turning it on will just show the triangle again, not more. Tried to hard reset like the fenix 3 light/down/back, but it seems not to work. Connecting to USB doesn't work ether. Always just the triangle.
Is there a different method to hard reset the 5X then with the 3? Does anyone else experience the same?

Thanks for the support!

Sebi