Elite 8300 SFF PC. I prepared a bootable USB flash drive but cannot get the Boot Menu or Boot Order configuration in BIOS to see the drive. Exactly the same as in this other unresolved thread: USB not available in Boot Menu
In "Device Configuration" (BIOS) it is listed, but NOT appear in the Boot Order configuration, even if I save changes and reboot. I have disabled UEFI and Secure Boot, enabled Legacy BIOS, as I intend to install Windows 7 x64. During boot I press ESC or F9 to show the boot menu and the USB drive is not listed. All USB ports are enabled. Tried front and back ports (except the USB 3.0 ones since W7 does not have in-box driver support for USB 3.0). I tried preparing it with both Microsoft USB DVD Tool and Rufus.
The flash drive has worked fine with several other PCs. e.g. I have HP Pro 4300 SFF and the flash drive boots no problem there it is configurable in BIOS and selectable in Boot Menu.
First attempts on Elite 8300 was with BIOS v2.99. But I also tried it after updating the BIOS to v3.03 because the release notes remarked about improving USB support, but there was no change same problem.