This sounds weird. fxload is only used to deliver firmware blob to the camera on startup. I'm on Ubuntu focal and INDI driver for QHY worked out of the box without updating fxload. I'm using the one from distro:
fxload 1.0~201712271246~ubuntu18.04.1 amd64
Which distro are you using? Also which architecture? I had issues trying to use the camera on RPi4.

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