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Download the fw from here
http://anker-bg.com/vlast3k/vesprino/latest.bin

Download the flashing tool for your OS from here
https://github.com/igrr/esptool-ck/releases/tag/0.4.9

and then execute something like (replace the comport)
esptool -vv -cd nodemcu -cb 256000 -cp "COM5" -cf latest.bin

to get previous firmwares, here is the list
http://anker-bg.com/vlast3k/vesprino/fir...161006.bin
http://anker-bg.com/vlast3k/vesprino/fir...161024.bin
http://anker-bg.com/vlast3k/vesprino/fir...161205.bin
3.Jan.2017 - http://anker-bg.com/vlast3k/vesprino/fir...170103.bin
3.Feb.2017 - http://anker-bg.com/vlast3k/vesprino/fir...170203.bin
21.Feb.2017 - http://anker-bg.com/vlast3k/vesprino/fir...170221.bin

You should move it to the vesprino part of the forum ;-)

on osx it did not work with the 256000 baudrate...

this worked... 

./esptool -vv -cd nodemcu -cp "/dev/tty.wchusbserialfd120" -cf firmware20160922.bin 

added link to previous stable firmware
http://anker-bg.com/vlast3k/vesprino/fir...170103.bin

(01-25-2017, 06:49 PM)admin Wrote: [ -> ]added link to previous stable firmware
http://anker-bg.com/vlast3k/vesprino/fir...170103.bin

some of the old firmwares that were more or less stable when released
http://anker-bg.com/vlast3k/vesprino/firmware20161006.bin
http://anker-bg.com/vlast3k/vesprino/firmware20161024.bin
http://anker-bg.com/vlast3k/vesprino/firmware20161205.bin