with the libusb installed i could make the dfu tool. thanks again.
but it seems that you are right with the vmplayer. the samsung usb device can be initialized successfully, but the first try with usb_control_msg() fails

i'm not sure if it could work this way. but i'm getting a valid usb handle...?!
what do you think markun?
cheers
jens
btw. i've a meizu M6 SL