Device doesn't reply

after I wated all day connectiong the device using USB-serial
I have try to use the bluetooth option in the chrome ide - https://www.espruino.com/ide/#

I can see the device
I can connect to it
but I get this error

CONNECTED TO WEB BLUETOOTH, MDBT42Q 2E7E (NO RESPONSE FROM BOARD)

how could it be?
what can I do now?

I have try with another board
I get this error

CONNECTION FAILED.

I have only conneced 3.3V and gnd to the devices

what is wrong?

Thanks ,