ESP8266 Huzzah - The board is not Connected [com3]

ESP8266 Huzzah - The board is not Connected [com3]

I'm trying to upload new firmware to an ESP8266 Huzzah board, which I had 3 months ago to upload new firmware to.

Now I am met by a communication error: the selected serial port _ does not exist or your board is not connected

I can see it flashing merrily on my FTDI USB programming device, but with the above error, the Arduino IDE suggests that no data is being transferred.

Have now tried on 3 different PCs with the same result. What exactly am I overlooking.

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