How To Use Memtest86 With UEFI

I've been trying to use the latest edition of memtest86.
Following the instructions in the extracted zip folder, I put a copy on a USB drive using the enclosed executable for that purpose.
When the process is complete it looks like (in "Drive Management") the USB has 4 partitions, one being EFI with a Windows 11 designated drive letter, and another with a designated drive letter labeled "RAW" which I'm guessing is the memtest emulation. Not sure about the other two spaces since Windows doesn't label them.
Windows keeps requesting to format the RAW partition which has a drive letter associated. So I just ignore that and attempt to boot by using BIOS to designate the USB. But when I get to BIOS it doesn't have that USB as bootable. It shows up in the USB part of the information but just not in the booting options.
I've read the instructions at the PassMark site several times and rebuilt the USB several times including the enclosed tool to zero out the USB a couple of times to make sure nothing interfered.
Anyone have experience overcoming hurdles with the new memtest?
Gigabyte AORUS B650 Elite AX

The RAW file system is a state of a storage device that has an unknown or no file system on Windows.

I also created a USB flash drive for Memtest86. This is what my USB flash drive partitions look like.



Please note that the bootx64.efi file in the EFI System partition has the old PCA 2011 certificate. You may have to replace it with the new UEFI CA 2023 cert if you have the updated certificates and revoked CA 2011 certificate.

suatsini54, Thank You for replying. Can you tell me where I might find the 2023 certificates? And my USB looks the same as you show. Do I assign a drive letter to the EFI partition then remove the drive letter once the swap is complete?
Also I don't know what these certificates will look like once I locate them.

bootx64.efi on the USB is the actual MemTest86 program, it's not the Windows boot manager which shares the same filename. There is no WinPE or WinRE environment, you boot Memtest86 directly into memory and run.

It's signed with the CA 2011 cert; and until the publisher offers a different version, there's nothing you can do except to temporarily disable Secure Boot when booting from the drive.

They would have to offer both a CA 2011 and CA 2023-signed version of Memtest86.

Do you have the new MS certificates installed and UEFI PCA 2011 revoked in your PC ? If yes, then in Windows Explorer open D: drive (This is the first partition on the USB flash disk. Your drive letter may be different.) There is the EFI folder there, in which there is the boot folder. The bootx64.efi file has UEFI CA 2011 certificate. The old certifcate that cannot be used in updated systems. My PC cannot use this file to boot because I revoked UEFI CA 2011. The certificate tells me that it cannot be used.



Now open C:\Windows\boot\EFI_EX folder. It has a file bootmgfw_EX.efi file in it. Delete bootx64.efi file in D:\EFI\boot folder and put this file bootmgfw_EX.efi in there. Rename the file bootx64.efi



Hope this helps.

Remember this should be done if you updated your Windows installation with new certificates and revoked the old certificate.

EDiT: I am sorry. I haven't seen @garlin 's answer while typing my answer. If @garlin says bootx64.efi file is not the same file as Windows bootx64.efi file, then you cannot use my answer. Please disregard my answer.

It's NOT THE SAME BOOT FILE.

If you open the USB's bootx64.efi with a hex editor, you can see all the MemTest86 screen messages inside. I know, I just did that before posting. Replacing the file means you just erased the Memtest86 program.

garlin said:

It's NOT THE SAME BOOT FILE.

If you open the USB's bootx64.efi with a hex editor, you can see all the MemTest86 screen messages inside. I know, I just did that before posting. Replacing the file means you just erased the Memtest86 program.

Click to expand...

I am sorry. That’s my bad. Thank you for correcting my mistake and informing those who are interested in memtest86 tool.

Thanks Fellas: I just ran Windows memory tester and it came up good. I realize this is far short of memtestx86 but for right now this is as far as I have been.
I have disabled Secure Boot in one attempt with no joy.
One curious thing I haven't tried yet is to enable CSM.
While scratching around for a solution I thought "Why not use Rufus?" so I cranked that up and ifs file system choices defaulted to either FAT or FAT32 (I can't remember right now but whatever, it was greyed out) and CSM so it may be Rufus will work if PassMark's USB installer doesn't.
I haven't altered anything to do with certificates and only put this machine together this past month.