Install CADIO Firmware on ESP8266
CADIO dynamic firmware for ESP8266 is available to download from Downloads center.
ESP8266 CADIO firmware consists of single binary file located at the address 0x0.
SPI flash mode is DIO.
SPI flash speed is 40MHz.
Make sure that DoNotChgBin checkbox is activated.
Make sure ESP8266 in the download mode by connecting GPIO 0 with GND before connecting the ESP.
You should erase the current flash before start flashing the firmware to avoid any issues.