The problem were:
1. On some distributions, the 85-qhyccd.rules was missing in /etc/udev/rules.d (despite repositories, strange!)
2. On one distribution, the line: ATTRS{idVendor}=="1618", ATTRS{idProduct}=="0715", RUN+="/sbin/fxload -t fx3 -I /lib/firmware/qhy/QHY5III715.img -D $env{DEVNAME}"
was missing.
3. On MeLE fxload didn't support microcontroller fx3, I had the get the source for that and compile it.
So it was a mess, but now it works.Looking forward for some moon and planetary shots!