Why No bootable device when installing Windows?

Question

Windows

Used Ubuntu 18.04.
For some reason, you need to switch to Windows.
Downloaded like everyone else from a torrent.
Installed on a USB flash drive (maybe some kind of flaw during installation). I reboot - the error gets out. Before that, there was nothing like this.
I did the operations with the bios that are mentioned on the sites, but there is no result. I repeat before this was not the case and therefore I think that the problem is not from the side of iron.
I apologize for the stupid question, I will be glad to help.
Thank you in advance.