How to make ISO downloaded from UUPDump bootable on a USB?

[DominikHoffmann]

I downloaded a Windows 11 ISO from UUPDump. When I flash that to a USB drive and try to do a clean install on a fanless PC with a Celeron processor, the installer tells me that there is no installable OS on the drive. Because balenaEtcher told me that the ISO I generated was not bootable, I used Rufus to do the flashing.

What did I do wrong?

 

[Neemobeer]

You probably need to make sure the USB and system are booting with the same scheme. Legacy (CMS) or UEFI