Hello. I did everything according to your guide, but I cannot see PATA drive in my boot menu.

I have P8Z77-V LX mobo which at first didn't let me install modded bios in it. It told me it couldn't read the file even though it was .cap.
I tried to remove header, tried .ROM file and everything but no luck. Tried also to boot bios from usb.
However I managed to flash the bios using ASUS UTILITY 2.0 updater. Or so it told me it was succesful. But I don't think so.
I installed my ADATA SX8200 and I can even see it in Device Manager.
I have windows on my usb-stick but had no luck booting from it after disabling CMS and other drives.

@s1me If you can't see your pendrive after disabling CSM, you didn't prepare it for EFI booting, in other words - you can't install OS using it on NVMe drive.
Use program like Rufus, to make a installation pendrive capable of UEFI/GPT booting.

PS. Without OS (or more specificly it's EFI boot partition), NVMe drive can't be available as boot option in BIOS/UEFI (and it can't be seen/detected otherwise at BIOS level).

I made it as far as installing the os in the ssd disk. During the installation windows started booting and it just took me back to starting new installation. So I guess it didn't find out how to boot from ssd. I tried to find the ssd in bios and change some settings but no luck.

Yeah that is what I mean. I tried to unplug usb in between restart but it didn't help. It says after reboot "the current BIOS settings do not fully support the boot device. Go to CSM parameters and adjust settings etc."

Also there is no PATA drive in my bios. The flashing part was the hardest part from beginning. Tried usb, tried disabling the header, checked the files and finally" flashed" it with AI utility. But seems like it didnt work. No changes in bios.

Do you see a "Windows Boot Manager" as boot option in BIOS after installation restart ?

No :/ I think I have to disable some kind of lock in the modded bios version to make it flash correctly. But that is tomorrows hay. Thanks for help anyways.

First of all, thank you Fernando for this fantastic thread and guide. And eveveryone else that helped. I have Asus P8Z77-V mbo, and recently stumbled on this thread and found out it could be flashed to support NVMe boot. I don't have NVME ssd yet, but am expecting one in a week or so. Nevertheless I wanted to prepare my mbo for it and tried to mod and flash the bios. Modding went successfully, the guide is precise and easy to follow. Couldn't flash the bios via Asus EZ Flash builtin utility due to failure of security verification, which was to be expected, but had to try anway :D
But more to the point, couldn't get it to flash via USB Flashback method. Tried with multiple USB sticks, the LED starts flashing, but stops very soon and doesn't flash. After double checking USB sticks, FAT32,filename, modded BIOS itself, I got the distinct feeling that procedure fails because it either refuses the file or doesn't see the file at all. So on that hunch I went to BIOS settings, and then to builtin EZ FLASH tool once again, and found out that this tool doesn't see USB FAT32 formatted stick at all, only my hard drives with NTFS filesystem. I remebered that I also didn't see it the first time in EZ FLash, when it refused to flash it, but tried to load it from my hard drive (NTFS). So with this suspicion and confirmation in mind, I reformatted my usb stick to NTFS, copied modded bios to it and started the USB FLASHBACK again, this time LED next to BIOS Flashback button continued flashing for longer time, and the procedure continued, the computer restarted and my bios settings were reset to default. So I think the flash was successful with modded bios.
I cannot confirm this yet, because I dont have NVMe SSD yet, but will do try to install OS and boot from it as soon as I receive the SSD.
Sorry for so long a post, just wanted to let anyone else that some motherboards don't read FAT32 formatted usb stick for USB BIOS FLASHBACK procedure, but instead need a NTFS formatted stick .
As soon as I get to try NVME ssd I will post the results here, but I'm pretty confident that it will work, now that I managed to flash modded bios to my mbo.

@Maat236
By experience , for the both ASUS mboards (Flashback aware) I have (P8Z77-V Deluxe and a Sabertooth X99) the Flashback operation does succeed only when using a USB v2.0 key (<16GB size), MBR partitionned and FAT32 formatted. Without respect of these 2 conditions the Flasback operation does not start. Moreover a USB key which has been used on a MAC machine should be MBR repartionned and FAT32 reformatted to get a FlashBack operation accepted.

First I have to say thanks for this documentation, this safed my day!

I bought the adapter QNINE Dual M.2 PCIe Adapter for M.2 NVME HDD (M-Key or B-Key) PCI-e 3.0 x4 Host Controller mit Low Profile Bracket for PC Desktop and a Corsair Force MP510 480 GB NVMe PCIe Gen3 x4 M.2-SSD, but I totally forgot to check the adapter for boot support and it failed, because my ASUS SABERTOOTH 990FX doesn't support nativly the NVMe protocol.

After a little bit of searching here and there I found this thread: And I successfully done it.
But as I don't trust downloads from unknown hosts to tools with names like CodeRush's UEFITool, I was looking for an trustful location and found it at GitHub (https://github.com/LongSoft/UEFITool/releases), just scroll down to "0.26.0". The A55 release wasn't working for me, I wasn't able to select Insert after... because it was disabled. The "0.26.0" was working for me. And yes I know it's based upon "CodeRush"... but safty first. ;)

My UEFI-BIOS hadn't the

Zitat von Fernando im Beitrag #1

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most important "BIOS region".

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Is there anyone who has succesfully flashed P8Z77-V LX modded bios? I have tried everything and seems like the security measures are too hard to bypass. Now thinking about buying CH341a bios programmer.