I managed to create a modded BIOS file for my motherboard and now I'm typing from the Windows installed on the M.2 drive!
I am attaching the BIOS file so others to be able use their motherboards with bootable M.2/NVME drives :D

Thanks for the guidance @Fernando, I hope this thread to help others who don't have time to work on it.
Just unzip it, put the file on a USB thumb drive, boot and press "End" key to start the Q-Flash from Gigabyte.
Follow the instructions, after flash, load BIOS defaults and then do whatever customization you had.
The PCIE M.2/NVME drive is now Bootable with our old motherboard :)

Here is bios F16d gigabyte version B75M-D3H :

**B75M-D3H :
Zócalos de Expansión

- 1 x ranura PCI Express x16, a velocidad x4 <<<<---- Here NVMe

(La ranura PCIEX4 cumple con el estándar PCI Express 2.0.)
- 1 x PCI Express x16 slot, operando a x16 (PCIEX16) <<<<--- Here GPU

* Para un rendimiento óptimo, si sólo una gráfica PCI Express se va a instalar, asegurese de hacerlo en el slot PCIEX16.

* PCI Express x16 slot soporta hasta el estandar PCI Express 2.0 cuando un procesador Intel de 32nm (Sandy Bridge) está instalado.
(La ranura PCIEX16 cumple el estándar PCI Express 3.0.)
- 2 x PCI

**i3 3240 :

Opciones de expansión

-Revisión de PCI Express 2.0
-Configuraciones de PCI Express ‡ up to 1x16, 2x8, 1x8 & 2x4

- 2PCIe = 1NVMe 4x + 1GPU 12x ?

Hi Fernando,
Can you have a look at this bios for me? I am sure this was modded properly but bricked my Gigabyte Z68 G1 Sniper 2.
Luckily I have a SPI flasher so it's all good, but wondering if the DXE was inserted correctly?
Also have a Z77 and another Z68 bios I have modded but gonna hold off flashing first.
Ps I also extracted the DXE file with MMtools and did a hash check with the original NvmExpressDxe_4.ffs, which all matched up

Edit: NVM it actually worked, it was my onboard GFX not playing nice with the Radeon graphics!

@Mjollnir1983 - So all sorted and OK? Got Ninja'd

Thanks guys, it was my Radeon, wouldnt play nice with Z68 UEFI bios. Swapped to onboard and everything was all fine again.

No idea why but that's mission for another day.

May need updated vBIOS in the motherboard BIOS, or updated vBIOS on the GFX card, or both

Hi Fernando, or some other kind soul out there willing to give me a hand. I'm stuck on a mechanical drive with extremely slow boot times and an older ASUS b85-e45 motherboard without m.2 slot.
I'd really like to get a m.2 SSD without upgrading my whole build, so simply order a PCIe adaptor, but am skeptical if it really will work.

So I tried opening the latest available UEFI firmware (which is from 2015 ) with the tool but was unsuccessful in locating this "target DXE Volume".
Would someone mind checking the firmware and/or the mobo specs if I'm wasting my time? Should it be possible in theory, or should I give up and consider ordering a SATA SSD?

https://www.dropbox.com/s/izi85tdvujoeib3/7817vA9.zip?dl=0
(you can download without logging in)

Thanks for all the contributions!!!

@Amivit - here is mod BIOS, and here is where you insert the NVME Module in UEFITool
Wait a minute, you mentioned Asus board, but linked MSI BIOS? Please confirm, and link your stock BIOS download page, then I will make a mod BIOS for you and show you where the module goes too so you'll know.

You're the best! Seriously, super appreciated.. How can I pay you back?

I don't know why I said ASUS, because it is in fact MSI... MSI B85M-E45 mATX

10.9 https://www.msi.com/Motherboard/support/B85M-E45#down-bios

@Amivit - You're welcome, and thanks for confirming board and link. Sometimes we all have 2-3 board going at once, so wanted to be sure what you needed modified before sending out any BIOS, in case you needed on some Asus B85 board instead of MSI
So, as previously mentioned, here is mod BIOS and here is where you insert the NVME module in case you need to know next time, or you want to make your own edit.

http://s000.tinyupload.com/index.php?fil...574676173195273

@Lost_N_BIOS:
Super handy. The file AND the guide! Conveniently zipped together.

This is a little off topic now, but to my disappointment, I found out there are only PCIe x1 slots available now. To my surprise, my laptop only has one x16 PCIe Gen3.0 slot, which is occupied by the graphics card.
Most adapters I see online are for x4, but I found this producton a Chinese shop. Could I use that and still get better performance than a traditional SATA SSD? 860 evo SATA vs 970 evo on PCIe x1 3.0? It's also a matter of being future ready, since I would like to upgrade everything in max a year... But for now, I just really need an SSD.

EDIT by Fernando: To save space I have replaced the fully quoted post (incl. pictures) by simply addressing to the author of the quoted post.

Zitat von Fernando im Beitrag #3618

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Zitat von MARSTG im Beitrag #3617

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Samsung SM951a contains that oprom to allow older mobos to boot from it?

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From whom did you get this information? Look >here<.

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