Today the watch totaly crashed by starting a run.
Hard reset does not work, i see only the triangel.
was updates.
All,
We are aware of the disruption of devices displaying a blue triangle when starting a GPS activity. Holding the power button until the unit powers off may or may not restore functionality temporarily…
All,
Thank you very much for your patience as we worked on this issue. Please see the steps from My Garmin Device Will Not Boot Past the Start Up Screen for a resolution. If you already performed the steps…
Although appreciated, it's completely absurd the only guidance we have are some other users suggesting button combinations to get these devices to power back on but not resolve this issue. Where is…

Yep, bricked Forerunner 255. I started a walk and flashing triangle. A soft reset does nothing.
I'm not using beta firmware; had an update about a week ago.
Additionally the Connect app on my phone…
I also have the same issue and received the blue triangle after wanting to start a running sequance. I resetted the entire watch (30 sec holding light, then start/back and down buttons together with light and releasing the start button). After reset and reinstallment of all settings watch looked ok. But after pressing running or biking... again same problem occured!!!
I am not in beta version but version : bundle 21.22
Just adding that seing same issue - Garnin crashes when you start a run activity - have doen mutiple hard resets but the problem persist. Any chance Garmin might provide an update at some point given it appears to be a software issue across multiple devices not just the 255