Without knowing more, it should probably look more like:
SUBSYSTEM=="usb", ACTION=="add", ATTR{idVendor}=="03fd", ATTR{idProduct}=="0007", RUN+="/sbin/fxload -v -t fx2 -I /usr/share/xusbdfwu.hex -D %N"
Without knowing more, it should probably look more like:
SUBSYSTEM=="usb", ACTION=="add", ATTR{idVendor} =="03fd" , ATTR{idProduct} =="0007" , RUN+="/sbin/fxload -v -t fx2 -I /usr/share/ xusbdfwu. hex -D %N"