Fenix 5x frozen and won't restart

All,

Today after charging my Fenix 5x I faced a nasty problem. On disconnecting my Fenix the faceplate kept on showing "100% charged".

After some hours I performed a soft restart and now it won't restart again. It keeps on showing the triangle and nothing happens.

After a couple of attempt I tried the hard reset (pressing lap button on start). No result.

I even tried to connect it to my Mac, to see if memory is full (I once had that with my older version). But it doesn't connect nor shows up in the explorer. So, also fail.

Does somebody has a clue what I could do now?