The result was a repeating reboot and I could not re-flash the device (yet)
I came over a page from:
https://riktronics.wordpress.com/2016/1 ... siest-way/
I downloaded the flasher and the binary. The binary would not run in my Win-XP in Virtualbox on Linux.
However the binary _did_ run under wine! I was able to get the nodemcu back on line with the
AT binary, when running it switches to a lower baudrate (9600).
After that I could rewrite the nodemcu with the proper firmware
For wine: in .wine/dosdevices check the symbolic links from the comx ports to the corresponding /dev/ttySx names, or /dev/ttyUSBx names
I used /dev/ttyUSB1 for the usb to the nodemcu.
Hope this may help others