S8 Co2 Reading 0

I built the DIY BASIC kit. The temp/humidity and PM2.5 sensors return valid values but the S8 CO2 reading is 0. I checked my connections and they seem fine, I also get a blinking led from it. Any solution?

Can you post pictures of the front and back of the board? Are you using the latest Adruino code from AirGradient?