flashing the firmware HM-10

Hello! I have a problem after firmware update (https://circuitdigest.com/microcontroller-projects/how-to-flash-the-fir…)

The update went well, but the modules are no longer responding. I know that after flashing the firmware, the HM-10's built-in LED stops glowing and it doesn't mean that the HM-10 is not working. However, I try to use the commands  AT and have no response

Can you help me? I don't find a respond on the internet!
Thanks