Hi Nicolai, thank you for your fast answer. I followed your steps. I don't have physical Linux machine at home except some normal Raspberry Pis so i used one of them. Same picture here RPIboot is not recognizing the RevPi and i can't see something in lsusb. I don't think this is a problem of RPIboot...

I wanted to boot Revolution Pi Connect from USB because of the small amount of storage one it. I did like described in that forum article: https://revolutionpi.de/forum/viewtopic.php?t=1977 Now it boots on USB but my image on that wasn't working. I tried to put it on other USB sticks and drives but ...