Hey @Fernando @Lost_N_BIOS and @ someone else who I can't seem to find in the list of tabs and form pages I currently have open......

I have legitimately been trying for months over the last year to mod my GIGABYTE X58A-UD5 FE5 Bios to allow NVME, I'm using Duet at the moment, since Clover does some spooky thing with my power where all my USB's don't get powered down and when I turn the system back on would restart post bios screen, and after a week or two my computer stopped booting out of the blue and was unable to use my XMP profile at 1600MH/z.

Now some issues with DUET at the moment are I can't use 2 GPU's due to not enough memory allocated or something (something to do with "Above 4G decoding" I'm guessing) and duet will also fail to load if I have my onboard USB 3.0 ports enabled (even if they aren't being used) that and it doubles my post time, so I'm really keen on hopefully modding the hybrid efi bootloader to load the NVME.

Now, I recall somewhere in the months of on and off research someone requesting some for of mod to a X58 bios, i couldn't remember what they were modding so I haven't been able to find it again (it was in this form though I'm pretty sure, I'm sure one of you helped with it XD), and they couldn't open the bios file in the program they were supposed to because it was a hybrid bios, they needed to open it into a different program (which from memory was something like NotePad++), remove the last -insert random hex/header/something here- save it, then load it into the program to mod it. That random stuff that I sort of remember I THINK was the hybrid efi section of the bois, I've read around that the Hybrid EFI actually gives the OS everything that it would expect from a EFI/UEFI system with programs like HWINFO detecting that it is one, so wouldn't it be possible, to insert a efi NVME module into the efi section of the hybrid bios to boot the SSD? If so, couldn't this in theory give "native" NVME to any board that supports hybrid efi? <- this is the dream

The plan was to do this by my self, and just pop out of nowhere like "sup, I have a thing" but right now I'm actually lost with how to open the bios file to start with, since I've lost the info I had -.- so now I'm here asking for help XD

@ShadowsNight - Your board is not UEFI BIOS, so there is no way I know of other than Duet/Clover type methods
As for your issues with either of those, if you post in the related threads maybe they can help you sort those out.

X58A does not have hybrid BIOS, only full on legacy, those w/ hybrid BIOS were only P67 and maybe some Z68

Woah what a quick reply! My understanding is that FE5 is a Hybrid EFI efi bios, which allows me to boot GPT disks, and the OS will detect it as EFI/UEFI

DualBIOS™ 3TB+ HDD Support (Hybrid EFI Technology)
3TB+ HDD support is an essential new feature for 2011 and has been one of the most talked about technologies accompanying the launch of the new Socket 1155 6 series motherboards. GIGABYTE not only supports booting from 3TB+ HDDs on all new P67 and H67 chipset motherboards, we offer the ability to boot from 3TB+ HDDs on all currently shipping GIGABYTE motherboard models (from high-end X58 chipset models down to the entry level new G41 chipset models) through GIGABYTE’s unique Hybrid EFI Technology.

Now my understanding is that it's just a efi bootloader, that you could, in theory put a NVME module into it? gathering from this infomation v

"Briefly, Hybrid EFI is a UEFI based on the open source TianoCore reference implementation. This implementation is also at the heart of UEFI DUET, which enables you to boot using EFI methods on BIOS-based computers. In fact, conceptually, Hybrid EFI is similar to using UEFI DUET, except that the EFI code is built into the firmware: Underneath the UEFI layer, Hybrid EFI uses an old-style BIOS."
"Contrary to the implication of many forum posts I found, Hybrid EFI is much more than just a way to get Windows to boot from a disk that's over 2TiB in size. To boot on such a disk, Windows needs to have a full EFI implementation, and Hybrid EFI delivers that. It also enables booting Linux or other OSes in EFI mode. You can install Linux, Windows, or other EFI-enabled x86-64 OSes in EFI mode even on disks smaller than 2TiB, if you so desire."
"Although OSes can see the firmware as a UEFI, and have access to the usual EFI features, the way it's bolted onto the older BIOS provides the user with few options. "
^ taken from http://www.rodsbooks.com/gb-hybrid-efi/ ^

Thanks, I try when I can

It's not hybrid BIOS in the way that's required for NVME mod. Maybe Fernando has seen it done and working, but I've never seen such on a legacy BIOS, we'll have to wait and see what he says since he's dealt with NVME insert and users issues/boards tested etc far more than I have
If he says it possible, I'm sure he'll tell me what's needed to be done before inserting the NVME module into your legacy BIOS, but I don't see this happening. Your BIOS is normal old Award/Phoenix Legacy BIOS that Gigabyte always used in this era.

Fair enough, Thanks for checking out my theory though :D

I'll keep searching the internet for the form I saw where someone needed to split the Bios file to mod the bios, they knew where it was supposed to be split.

I think I've made some progress, Now I've not done any Bios modifications other than flashing an existing modded bios, so my knowledge is purely hypothetical.

I've compared the FE BIOS for my board and the FD, FE introduced an OEM ROM called EXTBIOS.BIN a wopping 471040bytes of extra data, which I'm guessing is the new EFI section of the bios. Opening up the latest UD9 BIOS also has the same ROM but there must be more going on because it seems to have added Support EFI loader and was released almost a year later.
I'm wondering if we can 1. add driver to it, 2. do a switcheroo with a newer/complete efi revision that has easier driver modules or 3. just tack on rEFInd so we can choose to boot EFI drives. I've found more information on the EFI used with hybrid EFI, from my understanding it's pretty much based off the same source as DUET, which is where I think 1. has some merit. Courtesy of Roderick W. Smith's web page (www.rodsbooks.com) turns out he's the guy who made rEFInd after already having a "hair pulling" experience with a gigabyte mobo using hybrid EFI.

I've loaded rEFInd onto a CD after a failed attempt using USB since I knew there was an option to force EFI to run using the CDROM, and I've managed to boot into it, I just haven't managed to load the NVME driver, I'm guessing there is something I need to do prior to burning the disk, but despite putting the NvmExpressDxe.efi everywhere I can think of it's not detecting my windows install....

Anyway thought I'd update, and I think my next step is too keep attempting to get rEFInd to load the driver and hope my only CDRW doesn't burn out, or figure out how to open EXTBIOS.bin XD

THIS IS WHAT I WAS TALKING ABOUT! Probably irreverent but I found it again :D

@ShadowsNight - And, above info in post #7 in unrelated, that is about how to modify certain H/G/Q5/6xx series Award/Phoenix BIOS, by cutting BIOS module from the spacer/MEFW areas first so that crbom can work with the file.
I too was looking at EXTBIOS when you first posted, but unsure what to do there. Maybe @noInk - creator of DUET-REFIND NVME boot method could help you look at that file and figure something out? Please upload the file for him here in case he is willing to check it out for you

@Fernando Hmm.... following your instruction just seems to rename _EN_CODE.BIN too M9123FW.BIN it doesn't actually give me M9123FW.BIN :/
I've used Award Bios editor to extract them for now just to get an idea what the modules are used for. T1 appears to be the overclock tab in the bios. T2 appears to have something to do with GBT but is even part of the Pre Hybrid bios so I'm confused. T3 and T4 from the F6 UD9 Bios has a lot of nothing going on in there with both of them seemingly the same file and only a handful of code at the end? Curios.. with no decoded text I'm guessing it doesn't have any menu selection in the bios what ever it is.

Here is the EXTBIOS file which I'm expecting to be close to Tianocore, HxD doesn't have any readable decoded text for it.

I'm going to keep staring at the bios modules and see if I start seeing something EFI relevant XD

Yes, if you are still not sure (I didn't know you were unsure originally?) >> Cbromxx filename.bin /OEM7 extract

That would do it! I could have sworn i tried that.... It must have been during the stort time i accidentally had /extract. Thanks you guys are legends!

Ok just an update i still haven't found a way of opening EXTBIOS file. I'm going to try and install uefi windows onto another hdd see if i can get it to boot and see if i can use any efi/bios extraction tool and get something more from that.

On a side question, do any of you guys know the difference between OEM# Group# and Holes# in the Award Bios? I've seen the EXTBIOS listed under in them with different hybrid boards

I treat all those same (OEM is a "group", and hole is a "hole" Not same as group, but all extract/insert similarly)

You can open EXTBIOS in hex editor, that is all, unless Gigabyte gives you the tool they use to make and edit this, whatever it is.