no did not tried other cables yet, and i believe it would not make sense, cause updating went smooth and tranferring samples too. never had any issues. so i really dont think it is the cables causing troubles
immediatly after pressing Send in C6, my machinedrum says: update failed, switch off and try again. and no issues with sending/receiving samples or normal sysex data.
thats why its so strange!
in my mail to elektron support i mentioned both LFO bugs, i am curious what they have to say