I was experimenting with HID devices, but started receiving following issue:
Core started blinking fast cyan for ~5 seconds, then starts rapidly blinking red for ~5 seconds
I've thought I broke something, so I went online, ran "deep update" and flashed an empty application (setup+loop both empty)
But core was still failing
So I've applied firmware reset
And it is failing same way
After reset button it may work for a while, but then can fail again soon
it was temp issues with cloud