Just signed up to thank hancor and others for the effort to make this modded firmware available.
In my case, I put the nvme adapter (cheap 6 USD from Amazon) in PCI-E slot number 2 as it is faster than PCI-E slot 3. I did set slot 2 manually to gen-3.
I also did not need to disable CSM, once Windows was installed in UEFI mode, it was detected straight away in the uefi and could be used as an efi boot drive.

I'm actually pretty happy with the result, got 2186MB/s read and 858MB/s write on my Timetec 960GB nvme drive (74 USD Amazon).
For a nearly eight years old system it's an awesome upgrade that doesn't break the bank.

Cheers all, keep up the good work.

Hi there

Just a few questions:

When I plug my pci express adapter into 3rd red PCi express 2.0 4x/1x I just get around 420mb/s because always use 2.0 1x, however if I use the second 8x/8x I get around 2800mb/s read but my GPU runs at 8x and I lost some performance in game.
I saw there is another PCI express 2.0 4X (black) above the first PCI express x16 however my Noctua D14 cover that PCI, any idea about what speed can get in this PCI? any fix?

Regards & Thanks.

@onlygear

U have options in bios settings to change slots bandwidth (Black to x4) but with some drawbacks, its all in the motherboard manual, get to it.
I would never get that monstrosity of D14... sacrificing the PCIe 3.0 slot...

Thanks I will check this : )

Hello!
Did you ever get help for this? I keep getting the same error message, "Security Verification Failed."

Hello!
Please advise how to overcome the "Security Verification Failed" prompt that prevents me from updating with these new BIOS. Thanks!

Cant u read??? Posts and guidance...ring a bell?
Of course u get that error, its a mod bios file, its for using the ASUS Bios Flash back function, NOT on Windows/EZ or any other method.

Good I have an asus maximus v formula card and the 1903 BIOS and I need the modified BIOS to be able to install a ssd pcie nvme if someone can help me