ASUS M5A97 R2.0 BIOS reverts to UEFI, doesn't keep saved changes

I have an infuriating problem. I have a 'new' ASUS M5A97 R2.0. I've updated the BIOS firmware to the most recent version. 2603. My problem is that most of the time when I boot it reverts to wanting to boot UEFI and I have to go into the BIOS and move the 'Boot Priority' setting (see image) to last. I save changes and restart, but for some reason it doesn't keep this change. If fact, I never intend on booting UEFI on this computer and I'd really like to remove this option altogether.

Does any know how I can *insist* that it NOT try booting UEFI?
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jmarkfoleyAsked:
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☠ MASQ ☠Commented:
Have you already tried clearing the Secure Boot Keys in the BIOS Setup?  With those removed the system can't offer UEFI as an option at boot

https://www.qualityology.com/tech/disable-asus-motherboards-uefi-secure-boot/
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JohnBusiness Consultant (Owner)Commented:
If the BIOS is UEFI, that is the way it is going to boot. Since BIOS is going away soon (next year I think) best to leave it a UEFI.

Secure boot and boot order should be available within UEFI.
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jmarkfoleyAuthor Commented:
John HurstBusiness:
If the BIOS is UEFI, that is the way it is going to boot. Since BIOS is going away soon (next year I think) best to leave it a UEFI.

Secure boot and boot order should be available within UEFI.
Would this not mess up millions of non-UEFI systems, like Linux? With this mode in the BIOS, it boots to a screen with options and the user has to select a boot option. Not necessarily comprehensible to a non-tech user. It also would play havoc with computers intended to be servers which need to boot upon power-up. If a disk is formatted GPT, does it know to automatically boot correctly? My understanding is that MBR and GPT are things distinct from UEFI and "legacy". I have a GPT RAID array, but it boots non-UEFI.

MASQ:
Have you already tried clearing the Secure Boot Keys in the BIOS Setup?  With those removed the system can't offer UEFI as an option at boot
I'll check this out when I'm back in the office tomorrow and post results.
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JohnBusiness Consultant (Owner)Commented:
Why do you need to boot a UEFI machine with BIOS?  I do not need to do that on any UEFI machine.  What will you accomplish?  UEFI Boot works fine.

An older machine that boots with BIOS will still run. But new machines will only boot from UEFI.  Linux will have to adapt.
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jmarkfoleyAuthor Commented:
My problem is that if the machine has a non-UEFI boot device, I get the aforementioned boot selection screen. It doesn't "just boot". I have to reboot, F2 into the BIOS and move the UEFI boot order (which has magically moved to the 1st selection) back to the last selection. "Saving" the BIOS settings does not preserve this order.
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JohnBusiness Consultant (Owner)Commented:
That is what UEFI secures against.  

Does the ASUS UEFI BIOS not allow you to disable Secure Boot?  It should.
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nobusCommented:
you should look in the boot override options in the boot section   (scroll down till end)
and set the proper device there
then set the proper device also in boot order option
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andyalderCommented:
Not sure how Chipzilla can kill BIOS via the CPU/chipset. Even if they tweak it that the first instruction comes from a different address than currently there's nothing to stop someone writing a bit of UEFI code that puts it back again; set that code as the boot device and it would appear to any OS subsequently loaded that all the BIOS ROMs were in place.
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jmarkfoleyAuthor Commented:
It appears that as long as I'm boot from the installed boot drive I do not get the boot-time option list asking how I want to boot. This seems to occur when I insert a boot DVD. So far I booted from the 14.2 Slackware installation DVD which is old, and from the Acronis Recovery DVD for version 2016-2018. IN any of these cases I get the boot-list when rebooting and the "BIOS" has the UEFI DVD listed as the 1st device.

As this computer will be likely be converted to Linux sometime in the future, and as Linux also does seem to support UEFI (I think), I'll leave this alone for the time being. If it gets to be a problem for some reason I follow MASQ's advise and disable secure boot.
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JohnBusiness Consultant (Owner)Commented:
Thank you for the update.
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