Immediately after flashing, the USB port on the computer starts beeping on and off as if a device is plugged in and out of the USB port. Any connection to the device over USB serial fails.
Now, I open ESplorer after the beeping stops and I get
----------------------------------------------------
Communication with MCU...
Got answer! AutoDetect firmware...
Can't autodetect firmware, because proper answer not received.
----------------------------------------------------
The nodemcu-flasher cannot program the board anymore as well.
However, wifi works and I can see ESP_95BD50 access point and can connect to it and get an IP address and ping it at 192.168.4.1. So, the thing is working but any attempt to connect over USB serial fails.
I tried on other computer and also on Linux and all failed. On linux when the board is connected nothing appears on /dev/ttyUSB0.
This is totally crazy, I cannot tell what is going on. Can someone help me know what the problem is.