Thank you very much for your cordial welcome, Fernando.

Here is the download source of original BIOS file: http://download.msi.com/bos_exe/mb/7793vI4.zip

I believe that there should be some ways of recovering the mainboard after a bad flash, but I would like to take as many precautions as possible because I the flash chip is soldered to the mainboard and even though I have a parallel port Willem flasher (successfully utilized a few times), probably with even a suitable clip somewhere, I am so notoriously clumsy that I would rather do my utmost to avoid such recovery attempts.

On running E7793I40.exe, E7793AMS.I40 is unpacked into the user temporary folder.

MODIFIED.ROM has been modified with UEFITool.

COMPRESSED.ROM has been modified with "MMTool 502.0024 Mod" (MMTool 5.02_patched) by inserting the module as compressed (as are the other modules in the image).

AS_IS.ROM has also been modified with "MMTool 502.0024 Mod" (MMTool 5.02_patched), but this time by inserting the module as uncompressed.

It is interesting that MMTool Aptio produces images whose layout is much more similar to the original image file.

Which resulting file one should I use? Should I use the one which is produced by UEFITool, as it is recommended at the beginning of this discussion thread, or should I use one of the files produced by the patched MMTool Aptio?
Which one should I use?

I have also attached screenshots of the results of the process of modification using MMTool 502.0024 Mod; first as MMTool Aptio sees them, then as UEFITool sees them... and finally a screenshot of how MMTool Aptio sees the image produced by UEFITool.

I compressed the attachments with WinRAR (5.50), which, in my experience, produces ZIP files which are widely compatible.

Thank you for your advice, Fernando (even though I did not follow it in the end).
Eventually, I decided to flash the AS_IS.ROM image, the one modified with the "MMTool 502.0024 Mod" (the MMTool Aptio patched to support Aptio 4 UEFI images) to include the driver uncompressed.

The computer started without a glitch and listed a PATA drive (my Optane SSD) in the Bios Boot Specification (BBS) section of the UEFI.
So everything looks as expected.

Hi all!
I got ASUS P8Z77-V LK MB (BIOS v.1402) and willing to get NVMe boot option for Kingston SKC1000H. I've tried steps described here, but to no avail I get "Security verification failed" notification while uploading modded BIOS. So I already tried:
- modding source BIOS in UEFITool_0.25.0 and MMTool_4.50.0.23 by adding new NVMe modules
- uploaded using ASUS EZ Flash 2 Utility with fresh FAT32 USB stick - got "Security verification failed"
- uploaded using ASUS BIOS Updater in DOS - also failed
- interrupted source BIOS update to crush it, then uploaded modded one through CrashFree BIOS Utility - still no effect, several restarts and it returns to initial state (v.1402)
Please let me know how to trick that damn "Security verification failed". Thank you in advance!

Thank you, Fernando!
ASUS EZ Update really solves "Security verification failed" issue, but still do not see my NVMe in BIOS bootables. Please hint what I'm doing wrong.
I've tried uploading two modded BIOS versions: the one with NvmExpressDxe_Small (separetly tried NvmExpressDxe_4 either with no success) module added in UEFITool_0.24.0, the other with Nvme, NvmeSmm, NVMEINT13 modules (extracted from original Z97 BIOS) added in MMTool v4.50.0.23. NVMe do not appear bootable after restart, I still see it as flash drive only (in Windows10), also can install Windows10 on it.

p.s. ASUS USB Flashback ends with "Security verification failed" too, so ASUS EZ Update procedure is our only friend.

Victory!!!
Thank you, Fernando, you're the great!)
I saw PATA_SS yesterday, tried to boot it twice with no success, and continued other ways. Now it is all clear and works fine as bootable.

My MB doesn't support "ASUS USB Flashback", but yesterday I crushed BIOS and it showed me black screen saying to plug in USB with P8Z77VLK.CAP BIOS. It accepted only original.

So, for the others luckily have ASUS P8Z77-V LK and now want NVMe support I suggest:
- Follow every step on the 1st page, using UEFITool to get modded BIOS with NvmExpressDxe_4 module
- Use "ASUS EZ Update" (contained in ASUS AI Suite) procedure to upload modded BIOS without "Security verification failed" restriction
- When you see "PATA SS" in Boot Manager in BIOS, prepare FAT USB with Windows 10 x64 and follow steps on the 1st page
- And the last one, most important, NEVER deal with ASUS hardware!! (lesson learned)

Good Luck!

Thank you, Fernando, Ethaniel and EDK2 Team for this great work.
My pretty old mb Gigabyte GA-Z77-D3H now is working with NVMe drive on Win10 native, you've saved me from spending a lot of money on new motherboard, may be cpu/ram/etc.
So with my greatest thanks I've send a donation.

Hello Forum,

i am new here in Forum and have the System:
Mainboard Asrock Z68 Pro3 P2.10 with i5-2500K
SSD is a Samsung PM961 256 GB an PCIExpress 2.0 Slot
UEFI Update Utility "Instant Flash" is in BIOS integrated

Which steps i need for the boot function from PM961?
Have anyone a moded BIOS for my mainboard?
Thanks an all for your help.

Hi All,

Has anyone done any testing with the Samsung 970 EVO? I'm not sure if the new Phoenix controller will mess with compatibility.

For reference, I have an old MSI Z87 MPower with an Intel i5 4670k.

I am going to be upgrading MoBo and CPU next, don't worry ;)

Thanks all!

Hi Fernando,

my Problem is the right BIOS for the modding and the modification, flashing and installation is no problem