Came to say renaming EFI- to EFI (without the trailing - ) worked for me. Also resetting the UEFI keys helped on subsequent reboots.

What's going on with the USB creator app? I just don't get it.

The app already creates EFI for some time, are you using an old release?

On 1/1/2022 at 2:12 AM, Sypower said:

SOLUTION!  Well, a workaround at least.

 

I took the Debian live USB that was created using Rufus' "Add fixes for old BIOSes" option, and just replaced the Debian files with the Unraid files using a plain old Windows file explorer.  Honestly I'm a bit surprised that worked because it really felt like I was putting together puzzle pieces that were not designed to fit together.

 

Here's the recap:

• Download a Debian live ISO file: start with debian.org/CD/live, and then choose your preferred download source, architecture, and flavor, then download the corresponding .iso file.  (In my case it was "debian-live-11.2.0-amd64-xfce.iso".)

• Use Rufus to turn the downloaded Debian live .iso into a bootable USB.  Make sure to check the box "Add fixes for old BIOSes", which does some magic to make the USB bootable for my old machine.

• Download the Unraid manual install files: go to unraid.net/download and scroll down to find the .zip file for the version of your liking.

• Delete all the files on the Debian live USB and replace them with the unzipped contents of Unraid's manual install files.  There is no need to run the "make_bootable" script.

• Remember to rename the USB to "UNRAID".

Thank you so much, this fixed my usb stick. I could NOT figure out why it was not working & everyone I asked said user error.

On 7/17/2025 at 1:27 PM, lalcaraz said:

Came to say renaming EFI- to EFI (without the trailing - ) worked for me.

Same here. For me, the problem occured after migrating Unraid to a new machine. The old one didn't support UEFI, I think, so the folder had a "-" appended to it and wouldn't boot up in the new machine. After removing the - from the folder name, though, it booted up just fine. Thanks for the info, all!

I also had to rename it from EFI to efi (all small letters) so the USB would show up as a bootable device. Looking at the content of the Debian LIVE USB gave me the idea to change the name.

I'm hosting on a somewhat recent Lenovo ThinkCentre.

Came across this thread but in the end my issue was my 128GB USB drive was formatted as GPT, changing it to MBR and running the USB Maker tool again from Unraid solved the boot issue on an older system using UEFI boot

On 1/1/2022 at 8:12 AM, Sypower said:

SOLUTION!  Well, a workaround at least.

 

I took the Debian live USB that was created using Rufus' "Add fixes for old BIOSes" option, and just replaced the Debian files with the Unraid files using a plain old Windows file explorer.  Honestly I'm a bit surprised that worked because it really felt like I was putting together puzzle pieces that were not designed to fit together.

 

Here's the recap:

• Download a Debian live ISO file: start with debian.org/CD/live, and then choose your preferred download source, architecture, and flavor, then download the corresponding .iso file.  (In my case it was "debian-live-11.2.0-amd64-xfce.iso".)

• Use Rufus to turn the downloaded Debian live .iso into a bootable USB.  Make sure to check the box "Add fixes for old BIOSes", which does some magic to make the USB bootable for my old machine.

• Download the Unraid manual install files: go to unraid.net/download and scroll down to find the .zip file for the version of your liking.

• Delete all the files on the Debian live USB and replace them with the unzipped contents of Unraid's manual install files.  There is no need to run the "make_bootable" script.

• Remember to rename the USB to "UNRAID".

Thanks, this worked for me on my Aoostar WTR Pro 👑