On Tuesday, August 24, 2021 3:38:03 AM CEST Fabio M. De Francesco wrote: > I think that I've inadvertently switched the order by which usb_control_msg_send() > and memcpy() are called. I'm very sorry for not doing my tests, but (as I had said > before) at the moment I don't have my device with me. No, I did not switch them. There must be something else... Sorry for the noise. Fabio