Sorry, I had to be more specific; the idvendor (1618, QHYCCD) is clear, but my idproduct (0921) is not in the rules file to load a .HEX firmware file.

I expected something like this:
ACTION=="add", SUBSYSTEM=="usb", ATTRS{idVendor}=="1618", ATTRS{idProduct}=="0920", RUN+="/sbin/fxload -t fx2 -I /lib/firmware/qhy/QHY5II.HEX -D $env{DEVNAME}"

but than with {idproduct}=="0921"

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