Heres how I flashed my esp8266
download and install
https://github.com/nodemcu/nodemcu-flasher
https://github.com/thorrak/brewflasher/releases/tag/v1.0.1
https://github.com/vitotai/BrewPiLess/blob/master/bins/BrewPiLess.v4.0r1.thorrax.newui.4m2m.bin
Run brewflasher and connect to the esp8266...