No boot option for USB boot in Aptio Setup – AMI 2.22

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I have a new server with Windows 11. I’m trying to install Debian 11, but I can’t get the USB stick to appear as a boot option in the Aptio Setup – AMI bios.

Here’s what I did:

  1. Downloaded debian-11.6.0-amd64-netinst.iso and copied to a USB stick with: 
    $ sudo dd if=debian-11.6.0-amd64-netinst.iso of=/dev/sda
  2. Verified the stick was bootable by booting from it on another machine.
  3. Start the server, tapping F11, until I get a boot menu. Options are:
    • Windows Boot Manager on the internal disk
    • Enter Setup
  4. Enter Setup
  5. In Boot > Boot Option #1, my options are:
    • Windows Boot Manager on the internal disk, or
    • Disabled
  6. Security > Secure Boot > Secure Boot is set to [Disabled], but I’ve also tried [Enabled] after step 8.
  7. Security > Secure Boot > Secure Boot Mode is set to [Custom] to allow secure boot policy variables to be configured by a physically present user without full authentication.
  8. Security > Secure Boot > Key Management > Enroll Efi Image was used to load
    • USB -> /efi/boot/grubx64.efi
    • USB -> /efi/boot/bootx64.efi
    • These keys now appear in Authorized Signatures (db) (even after reboot).

There are similar questions out there:

Aptio 2.22 @Asus PN52 – how to enable boot from usb stick and install Linux?

But these all said there was a problem with the USB stick. I’ve verified the stick is okay by trying it on other machines. I’ve also tried using the stick in different USB ports (one port is coloured ligher-blue than the others) to see if one granted extra permission.

Update:

I found another disk with a bootable backup utility on it, and it was detected just fine. So I figured maybe it IS hardware. I re-copyied my installer:

$ sudo dd if=debian-11.6.0-amd64-netinst.iso of=/dev/sda

But that wasn’t detected as a bootable device. Following the Debian Wiki, I tried the equivalent, but recommended:

# cp debian-11.6.0-amd64-netinst.iso /dev/sda
# sync

And that also had the same problem. So perhaps it’s a problem with the ISO being incompatible with this specific Aptio Setup. Someone else in the office suggested that I create partitions myself, but I’m not sure whether that’s good advice, or how I’d even implement that.

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