Keep Bricking my Dell T7820 [Modding Rebar]

[pk223]

I am not sure exactly what is going on, I have tried this over weeks multiple times, and bricked a whole motherboard already; BIOS chip got fried on that one.

I got a replacement motherboard, and still trying to patch ReBar into my system (I really need to use my A770 GPU to its fullest for some projects) but I keep soft bricking it (Can recover with a USB and rcv file).

Here is my process:

• Unlock FD by jumping service pins
• Dump BIOS region
• Modify RebarDXE.ffs into BIOS dump using UEFITool (Old Engine; An error about non-uefi data in volume's free space)
• Patch using UEFITools (apparently my BIOS doesn’t need patches according to the tool)
• Using FPTW64 to flash BIOS region
• Reboot after successful flash

Unfortunately after the reboot the system bricks and won’t POST. I am attaching my settings below.

BIOS Version: 2.42.0
Intel ME FW Version: 11.22.96.2588
Intel CSME Tools Version: 11.8

I am suspecting it might have something to do with BootGuard? Is there a way to bypass this?
It could also have something to do with the "non-uefi data found in volumes free space"

Attaching a screenshot of a “successful” flash below. I would be so extremely grateful to anyone who can help me out with this/point me in the right direction. It has been a month since I have been trying to figure this out, and I have already bricked a motherboard and BIOS chip (not recoverable with CH341a as there was a short somewhere)

I can also upload my BIOS & patched .bin files for anyone to go over

 

[eidairaman1]

Build a rig.

 

[pk223]

Build a rig.

That wouldn't be any fun. I do have a "normal" rig. I like my system, would not have bought a replacement board otherwise.

 

[silentbogo]

Can you attach your old BIOS and whatever's on the output after all manipulations? I'll have a look at it.