Hello
I have the same problem then you have one time :( I read one topic of you and i see you solve the problem
I have the board pegatron 2AB6 H67,
and when I put in the new graphics I bought, I turn on the computer and simply lock the HP logo, if you press the ESC quickly to enter the bios then it blocks.
I would like to be helped since they have been able to solve this problem by Bios. So I'm not a big expert on the subject, and I do not even know how they created the .rom file to open with the amibcp 4.55 program and change from PCI rom priority to Legacy ROM.
Can someone explain me step by step to do this?
greetings

I had a PEGATRON IPISB-CH2 board, came with a preassembled desktop pc (HP pavilion HPE1151-it). I completely changed it because I found the PCIe slot was locked from updating the GPU, but maybe you motherboard is newer and has UEFI support (mine had Legacy). Now, lots of forums said newer GPU don't support Legacy, but only UEFI, so this is why I decided to replace it with a "newer" motherboard.
Now I have an asus P8H67M PRO motherboard which also was from a preassembled PC, bought used on ebay (40€) but the seller didn't tell me where it came from... And it had the same problem, I wasn't able to upgrade GPU: it stayed stuck on the POST screen. So this was confirming me that producers may lock the pcie slots on the motherboard included in their preassembled desktops in order to avoid upgrading the GPU. It makes sense, after all.
Luckily came with UEFI so I decided to try and I swapped the PCIe module from the original board... it's a fairly long story, but if you are interested in this, you can check out it here in the main post:

https://www.reddit.com/r/buildapc/commen...pgrading_my_pc/

soo.. I managed to boot with my new GPU (a gtx 1050ti) but looks like I completely fucked up the back panel audio connectors of the motherboard. I replaced all the PCIe related DXEdrivers using UEFItool (=everything that had "pci" in the description, lol) specifically those named:

pciExpressDXE
pciHostBridge
pciBus
pcieSmm

I'm gonna be honest, I had no idea of what I was doing (at least, theorically) but it somehow worked. Now, if someone tells me that one of those drivers are involved in the audio panel I can retry flashing the modded bios...

edit:
I tried swapping only the pciExpressDXE module, but the audio issue is still there. I mean, is it normal that the audio is somehow related to the PCIexpress stuff? Looks weird... @Fernando I'm sure you are way more experienced than me, do you have any clue about this? My guess is, even if the "enhancements" made by Asus on the original board are related to the PCIe compatibility with newer hardware, those are not located inside the pciExpressDXE driver but still doesn't explain why the audio from my motherboard's back panel disappeared and also, if I were wrong, then I can't even explain why swapping that module my GPU started working perfectly fine

After modifying the BIOS with the utility, you need to install this already modified BIOS? Which program should I use to update? Motherboard Pegatron 2ab6. Through tell me how to update through the BIOS, a lot of patrol through afudos, but I do not understand how to pereroshit through freedos, please help

Sorry for my english. pererosht =reflash

@Dexter - so you want BIOS option at PCI rom priority switched to Legacy ROM, as well as putting video oprom to disabled unless uefi - per post #12 on page one? To me, that looks like the only sound advice on this thread, and the only report of success.

If yes, please link me to your BIOS download, so I can see default flashing program and process and then I can make BIOS for you and show you how to update

Someone has created the modded bios for the mobo PEGATRON 2AB6 ?

An user called "dealth" has modified the bios and right before the POST screen now appears the "legacy oprom" of the Graphic card initializes, and somehow makes it work.

Someone has this modded bios ?

Thanks in advance.

@74lobster - Maybe you mean "DeathBringer"? If yes, show me were you see this, and I will tag him here if it's the same users.
Ohh, I see from link in PM you sent it's not DeathBringer.
From that thread, see post #9 for mod BIOS, or dump your own BIOS and send to me, or you can edit with AMIBCP to make this change, it's the only change required to make it work >> PCI ROM Priority to Legacy ROM

No,

this user:

u22206_dealth.html

This is the original thread, please take a look (should be also attached the original file to modifiy):

[HELP REQUEST] Modify BIOS to show hidden settings - change Video OpRom policy - with programmer

Hi, have you tried to edit the bios of the mobo PEGATRON 2AB6 to enable the option "PCI ROM Priority to Legacy ROM" ?

il yes, could you please share the modded bios and also the files needed to upload it to the motherboard ?

Thanks a lot.

I signed up because I'm having this same problem now as well. I understand the theory but it looks like there's still no solid answer on whether this has worked for OPs motherboard (same as mine)