Sound like the battery protection circuit has tripped. Try pluging it into a none intelleegent USB charge for around 5 hours (with the charger switched on) and see if it come to life.
If not, it could be that it has died and needs replacing.

@an-erd said in How to use the Buzzer in M5Stick:

I tried to use the buzzer on M5Stick.
In UIFlow I used Advanced > PIN > digital write pin 26 to 1, but you don't hear the buzzer. You can feel that M5Stick "tries" to do it.

So what did I wrong? I expected to have a buffer as in a mobile phone to at least feel if vibrating or to hear a beep?

You don't do that in UIflow, you use speaker.tone(1600, 200) or speaker.sing(220, 1)

from m5stack import * from m5ui import * clear_bg(0x111111) speaker.tone(1600, 200) speaker.sing(220, 1)

or the Speaker beep and play tone blocks in the blocky mode.