"For both this basic schematic shown here in the Readme and how they it is laid out, you must use the ESPHome fork of ratgdo and - for ESP8266 based boards - select the blue v2.5 board on the ESPhome web installer page."
The web installer page only lists black and white boards. There is not a blue board.
There are 2 black 2.5 boards available.
There is also a minor readability issue in the first line.
The section Install Requirements begins with:
"For both this basic schematic shown here in the Readme and how they it is laid out, you must use the ESPHome fork of ratgdo and - for ESP8266 based boards - select the blue v2.5 board on the ESPhome web installer page."
The web installer page only lists black and white boards. There is not a blue board.
There are 2 black 2.5 boards available.
There is also a minor readability issue in the first line.