Dear Polanskiman,
thanks for helping!
Setup screens mean all info screen in video from begining till the end of this video. And video is till the end, the screen what you can see in the end of this video is final screen what i can see if i use new flashdisk (with new loader). But if i use old flashdriver with old loader and synology 5.2, booting works well. Because this i think that setup of usb as first drive is right in this machine. Maybe i need setup something else in bios. If you will be so nice, please see my bios setup in attachemet.
Thanks for your time! Tom