VirtualBox not booting from ISO in Windows 11

If VirtualBox is not booting from ISO or if GParted ISO is not mounting, correct the Boot Order in System Settings and verify ...
Ars Technica

Is there an equivalent of Rufus but for creating bootable .iso files

I'm trying to apply an individual BIOS update to many servers. In the old days, I'd use Rufus to make a USB stick bootable, copy the BIOS update file to it, walk to the server room, plug it in, boot ...