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The firmware is not the problem just the function was not made available until later versions.

You can go direct to the latest.

providing you have set an L port to temp 1 controller output and saved that setting, in the temp screen the feature should not be greyed out.

Just done the exact same thing on mine and it is fine.

sorry thats what I meant set to controller output. Assuming you are using a fan breeze controller.

Now go to the temp screen and you will see a box labelled 1-10V output.....

Go to 1-10V interface screen

Set an L port to temp1 cooling

This port will now react to your cooling temp settings in the temperature control screen that you have designated