Finally I've found by myself.

Quick reminder : I use a Raspberry Pi 4B with an astro distribution called Easy Astro Box based on raspbian busters with Kstars 3.5.0 beta

Here are the commands I've used :
sudo apt update
sudo apt upgrade

Then I've followed the instructions on the webpage : indilib.org/get-indi/download-rpi.html

I've choosen the option 1 to only update the INDI libraries including all third party drivers.

So it works now with EKOS. The version of QHY SDK that I have is 20.8.26.

Maybe it will help some of you.

Now I have to make it work with FireCapture.

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