Go back into you BIOS where you were when you changed the boot priority order. There should be that may say BIOS Boot Mode and change that to Legacy. Will need to also check to make sure that the Secure Boot is disabled.
Once that is complete double check that the boot priority order is still set correctly I have had some that I have had to redo after I have changed to Legacy. Included 2 Screen shots. Select Save and Exit see if that helps. Now once the file has been deleted off the drive go back into the BIOS and put the 2 that you change back to what they were.
[IMG alt="mblegacyboot" width="600px" height="445px"]https://docs.oracle.com/cd/E37437_01/html/E36284/figures/mblegacyboot.png[/IMG]
[IMG alt="Load-Legacy-Option-Rom" width="690px" height="378px"]https://www.nastrojkabios.ru/images/stories/bios/2/Load-Legacy-Option-Rom.jpg[/IMG]
Once that is complete double check that the boot priority order is still set correctly I have had some that I have had to redo after I have changed to Legacy. Included 2 Screen shots. Select Save and Exit see if that helps. Now once the file has been deleted off the drive go back into the BIOS and put the 2 that you change back to what they were.
[IMG alt="mblegacyboot" width="600px" height="445px"]https://docs.oracle.com/cd/E37437_01/html/E36284/figures/mblegacyboot.png[/IMG]
[IMG alt="Load-Legacy-Option-Rom" width="690px" height="378px"]https://www.nastrojkabios.ru/images/stories/bios/2/Load-Legacy-Option-Rom.jpg[/IMG]
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