Buy a new board that contains new FW at a significant cost...
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Yes this is true there is no way to upgrade the Jandy firmware without a new board. However, that said, I have found no reason to ever upgrade my board. The only thing that I found that was board specific was the SmartJVA board which needed a specific firmware or later to work. But I had that and anything new would support that as well.
Brings me to another bonus with Jandy. It is the only automation that allows 5% incremental positioning of the valves via their SmartJVA board. This allows you to adjust on the fly flow to waterfalls and such. I can turn my waterfall into Niagara falls if I want or just have it a quiet trickle. My sheer descent can also be adjusted to wide open or a slow flow. Without this your valves have two positions that are preset within the valve mechanics and not designed to be changed.
Oh also Jandy has an Alexa skill. I can turn the waterfall on, heater, lights, etc via Alexa.