@Elza.
usally with two solutions:
1 upgrade, you should clean your U disk and copy FWM file to U disk,then turn off machine and plug U disk,wait a moment(one minute maybe ), plug off U ,the machine will restart again ,then the control card upgrade successfully.
or 2 copy DLL file to laser cut to instead of the former files.
Hope this can help you
Best Regards
Lucy Lee
G.WEIKE LASER