We have not had any issues or reports from customers or in our lab systems with this board and enabling UEFI. Please make sure you followed a clean installation of the Operating System and that you have the latest BIOS update available.
The latest BIOS version can be downloaded from the following web site:
Please be sure to read and follow all accompanying instructions, which can be found at this link:
My system work with UEFI boot check as long as I also have legacy boot checked as well. Are you saying to install the OS again with only the UEFI boot option checked without the legacy boot box being checked? I am on BIOS version 0061 but I just had a support tech in chat tell me to roll back to version 0049 as that was the version the Marvell Controller was fixed because it is now broken again and my secondary drive is disappearing with any transfer ( large read/write) to or from the drive. The ticket number on that is 8000598167. I really don't want to flash back 12 versions with all the long list of fixes since then if that makes sense. I'm not the only one with the drives disappearing requiring a reboot each time and that's my major problem at this point. Thanks!