It looks like my Dash (U270) was bricked during firmware upgrade.
I tried to flash fw update using standalone dashupdater and now
my only terminal output now is:
After power on white LED switched on for 8 secs, rapidly flashing, and finally off.
A new fw update using dashupdater starting succesfully but quickly finishing without any changes in Dash state.
Any recommendations how to recover my Dash now?