https://learn.sparkfun.com/tutorials/esp8266-thing-development-board-hookup-guide/all 12/24
If every upload attempt results in an error ending with something like error: espcomm_open failed
Try changing the board to Generic ESP8266 Module, and in the sub menus, make sure the following sub-menu's are also set:
Flash Mode: DIO
Flash Frequency: 80MHz
Upload Using: Serial
CPU Frequency: 80MHz
Flash Size: 512K (no SPIFFS)
Reset Method: nodemcu
Faster Uploads! The serial upload speed defaults to 115200 bps, which is reliable, but can feel a bit slow. You can
increase the upload speed by a factor of about 8 by selecting 921600 under the Tools > Upload Speed menu.
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