Someone asked for the steps I used. So here they are.,
1. download the ISO image from the Samsung website. (Link above - make sure you grab the correct image)
2. Make a bootable USB flash drive from the ISO. (I used Rufus - but I'm sure there are others) I did this on Windows.
3. If you feel paranoid, I would make sure you have a everything on your cache drive backed up. - I didn't lose data but better to be safe than sorry.
4. Shutdown Unraid.
5. Yank Unraid flash drive and put in the Samsung ISO image drive you just created.
6. boot the Samsung image and follow the prompts to update the firmware. Some folks had issues with a USB keyboard in the past. I had no issues.
7. Power down the unraid machine again
8. take out the Samsung flash drive and put back in the Unraid flash drive.
9. Power on the Unraid machine and verify you have the updated firmware.