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Installation image (ISO) not UEFI bootable

Matt Brossett

The motherboard I am using only supports UEFI OS. When I attempt to create a USB boot drive using Rufus with "GPT partition scheme for UEFI" setting I get the error...

"Unsupported ISO - When using UEFI Target Type, only EFI bootable ISO images are supported. Please select an EFI bootable ISO or set the Target Type to BIOS"

 If I use the MBR partition scheme for UEFI, the server will not recognize the boot drive. Win32DiskImager and Etcher did not work either. I also used IPMI to mount the ISO but it still wasn't recognized.

Does Sophos have an ISO that is EFI bootable? I am using a new SuperMicro SuperServer E200-9A. Their support says I must use a EFI bootable ISO and GPT partition scheme. Does anyone have a solution to this problem?



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  • 0

    Me too!

    Please, help, there is no way to install SFOS on a particular device which only supports UEFI.

    Thank you!

  • 0 in reply to LuCar Toni

    Hello!

    I did it exactly as in the link you provided.

    As a matter of fact, I did try with Rufus twice, "write in ISO image mode" at first, then "write in DD image mode".

    And after that, I did try each and any alternatives to Rufus I could find as NOT discontinued on alternativeto.net website (most of them redundantly, I know, but I said to try every real option).

     

    Suffice to say that the USB sticks (two of them) I used had no problem booting on that machine with other ISO images, Win, Linux, FreeBSD. Also that the ISO image of SFOS has no problem booting on both my desktop and my laptop, burnt on a USB stick or a DVD-ROM.

     

    I concluded that (and if you pay attention to the screenshots from the link you provided, as it happened the exact same way in my case, Rufus opens at first with the default option "MBR partition scheme for BIOS or UEFI", and after the SFOS image is selected, that option changes to "MBR partition scheme for BIOS or UEFI-CSM". Which means that) the SFOS ISO image is not at all UEFI compatible, and it needs a CSM (Compatibility Support Module) to be able to boot from. More so, even if you manually try to force "MBR partition scheme for UEFI" or "GPT partition scheme for UEFI" options, Rufus returns an error stating:

     

     

    I did manage to boot from USB stick, eventually, using "AIO Boot" which loads grub2, and then included the SFOS ISO in the boot options menu, to be able to further select it to continue booting from it, but with no success. Tried every possible and impossible combination of ISO writing tools and UEFI BIOS settings on that hardware (most of them hints from similar situations returned from G Search), meaning Rufus with or without XHCI, with and without CSM enabled, and with CSM enabled, with and without storage compatibility mode set to Legacy, then UEFI, made sure that secure boot is disabled... then Etcher with or without XHCI, with and without CSM enabled, and with CSM enabled, with and without storage compatibility mode set to Legacy, then UEFI, made sure that secure boot is disabled... then AIO Boot with or without XHCI, with and without CSM enabled, and with CSM enabled, with and without storage compatibility mode set to Legacy, then UEFI, made sure that secure boot is disabled... and what not!?!?! I even tried with converted "IMGpart" and "partIMG" formats of SFOS ISO file. No success either. Several many hours, in 3 different days...

    So, if somebody could provide a full UEFI compatible ISO image, one which would not change Rufus default write mode from "MBR partition scheme for BIOS or UEFI" in "MBR partition scheme for BIOS or UEFI-CSM", and which would not return an error when trying UEFI target type, please do.

    Thank you very much!

  • 0 in reply to LuCar Toni

    The issue is that the SFOS ISO is not UEFI bootable. As Ciprian has detailed very well, there is no way to get around this. We need an SFOS ISO that supports UEFI boot.

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