This bootloader will allow us, among other of its many features, to boot from USB devices on computers that their BIOS does not support (even in virtual machines, That sometimes we've needed it). It is downloaded in ISO format and we will connect it to the VM at boot.

We lower it from: HTTP://www.plop.at/en/bootmanager.html#download, we could even install it.

And this screenshot inside a virtual machine shows that we could boot an operating system from a pen drive.