Is there a sure fire way to know if a modded bios will work or at least not brick a motherboard?, the board in question does not have flashback so if I was to do it I would need to know if it was going to be successful.

@LiquidCRA - Once mod BIOS is done correctly, you can flash via M-Flash if you rename the mod BIOS name.extension to match the original BIOS file
As Fernando mentioned, if you use 4.50.0.23 the mod is done correctly, I did the mod too, so now you have two of us checking this edit for you.
But in this case of mod BIOS you should not have any thing to worry about provided you did the mod with MMTool 4.50.0.23, and that you safely flash the BIOS (ie not during storm, do not interrupt etc)
Flash can go bad at any time, for no reason, even flash of stock BIOS using stock method, so there is always "some" risk

Hello !

Thanks for the wonderful guide !

I'm trying to insert the nvme inside the gigabyte z77x-ud3h F18. There was not enough space so I inserted NvmExpressDxe_Small using MMTool. I flashed the bios and everything seems to be working correctly (didn't test the actual nvme ssd yet since it's on its way).

BUT

I didn't know about the Pad-File issue. I realized it was something to be aware AFTER the facts. So I compared the bioses using UEFITool and I can see that it actually did removed a Pad-File. So to be safe, I flashed the stock BIOS back because I was afraid it might be a problem.

Also I did try to insert using UEFITool 0.25 and 0.28 and the same Pad-File is removed.

Can you help me with that ?

Thanks for your support ! Here are the zip files

Hello everybody,

First, I want to apologize for my level of English, it's not my native language ...
Secondly, I would like to thank people who have done all this work to allow NVMe SSDs to be integrated into old Bios that are not supported by the manufacturers.

Having seen Chinese X79 motherboards with native NVMe support, I figured it was possible, so I tried looking for a BIOS with NVMe support for my ASUS Z9PE-D8-WS motherboard. No luck, No BIOS, I didn't find it ... And finaly after long time to check the possibily to find à BIOS, I found this forum last night, and I found all these posts and explanation steps allowing NVMe support in AMI Bios. THE DREAM ... YEAHHH ... Thank you boys...

Having already modified graphics card Bios to mine crypto, I said to myself, I must... I need try it. So I made the modification of my original BIOS (downloaded from the ASUS site) during the night.
I also compared the two BIOS (original vs modding) and didn't see any differences apart from the remaining size. It seems logical to me because I added datas from the NVMe support.
Is it right ?
http://gbb-technics.fr/Archives/Divers/Bios/File_size.jpg

Now, I'll try to explain my problem quickly and simply:
I follow all steps to mod ASUS Bios, then I have extracted the *.ROM file from the CAP Bios, do the modifications, copy the result with HEX program in a new file and finaly save the new file as *.CAP
But I saw that some members had problems after editing their BIOS, UEFITool can change or remove "PAD-FILES".
I don't know what a "PAD-FILE" is, and I have actually seen this king of "file" in my BIOS called "PAD-FILE" and "PADDING". I don't know the difference between the 2. Is it the same?
http://gbb-technics.fr/Archives/Divers/B..._vs_PADDING.jpg

Then, I compared the structure of the 2 BIOS, and I don't think that this problem appeared in my modding, but I would like to have confirmation from a people who knows the subject very well.
The ASUS Z9PE-D8-WS card is a dual XEON card, OK, it is old motherboard now, but it still costs quite a lot on occasion, and I don't want to burn it because of checks that I did not do.

So what I would like to have is a confirmation that there is no modification on "PAD-FILE" and/or "PADDING" structures in my moddes Bios.

Thanks in advance for your help.
Stephane

Thanks for your fast reply

I'm ready to flash my Mobo with this new Bios.

I will give you news after this step.

Stephane.

Zitat von Fernando im Beitrag #5977

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@bergelru: Your BIOS is one of the very rare ones, which cannot be correctly modified by just using an AMI MMTool or or the UEFITool.
Our expert for such more difficult BIOS modding operations is Lost_N_BIOS.......

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Zitat von Fernando im Beitrag #5982

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Thanks for your interesting statement regarding the possible origin of the Pad-file problem while trying to insert the NVMe module into the F18 BIOS for the Gigabyte GA-Z77X-UHD3H........

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@bergelru @Fernando @lfb6
Since this user already tested the pad-removed BIOS, we know it's OK on this model.
Sometimes it's OK to add/remove, but of course, do try to avoid giving BIOS to someone when you notice this, without asking them if they can recover and or want to test such BIOS, just in case it's a brick.
No way to know without brick risking flash attempt.

To work around the issue, sometimes can take hours..... But, it's generally possible, and I may have done it already for this model
I usually remove 5-10 larger modules inside the volume, and sometimes if nested volume I also remove everything below it from it's main/major volume
Then do my dance of insert one by one, few here, then few there, then all at once, or add some in one way (tool) some another way (Dif tool), etc until it's all back in correctly without the paddings being affected (added or removed)
This dance above, is what takes forever, sometimes your 10 steps in and almost done, then last module kills it and you have to start again trying another way instead, something else first or last, something else before something else etc and so on.
In the end, all goes back where it should, nothing is removed and all paddings remain as originally there. * Edit - Ohh, almost forgot, sometimes I cut the main logo too, long strip of black off top or bottom, since it doesn't need to be that tall

I checked, and have already done NVME mod for Z77X-UD3H F20e - [OFFER] Gigabyte GA-Z77-DS3H NVMe Mod (3)
Do you guys really need me to sort on OLD F18? If yes, I will, you know me
And, since I said that, you know what happens now... Downloading F18 and I'll be back

I love this board, still have mine too! It's a great Z77 board!

@Lost_N_BIOS thanks for all the information !

Basically you're saying that since I was able to boot and use the pad-removed BIOS, it should be OK ? Is there the possibility that something might be unstable or not working that I haven't noticed yet ? I guess so since you are willing to spend time to do it perfectly ? :)

FYI, the Z77X-UD3H F20e link doesn't work anymore. I can't download it ("This site can’t be reached"). I wouldn't mind using it, I always used F18 since it's the last non-beta bios. Since you are using the same board, can you confirm if F20e is stable ?

Yeah I love that board. I've been using it for 8 years already and I intend to get all the juice from it until I retire it ;)