[SOLVED] Can't patch modded BIOS with UEFIPatch after using UEFITool/MMTool - MSI B450A PRO MAX & RTX 2060

[LL4nc33]

As the title says, I can't patch the bios I modded with UEFITool. I always get the output "No patches can be applied to input file".

I skipped this part as the guide "https://github.com/xCuri0/ReBarUEFI/wiki/Using-UEFIPatch" says, because my MB has native ReBar support since AGESA 1.2.0.0 bios rolled in, but the output file after inserting the *.ffs into the bios with UEFITool is not being recognized by M-Flash.

In MMTool I can't even find the PCI-Bus so I can insert it there:
(*MB0 is the last version before the implementation of 4G Decoding, ResizableBar and AGESA 1.2.0.0)

(*MN2 is the newest version which natively suppports 4G Decoding and ResizableBar)

I even tried downgrading the bios to a version before AGESA 1.2.0.0 but it still didn't work and the ReBar option which was added with 1.2.0.0 was also gone.
So for now I am using the most up to date version of the BIOS where I can just enable ReBar (it greys out the 4G decoding below and automatically enables it without the option to disable).
BIOS "7B86vMN2(Beta version)" here -> https://de.msi.com/Motherboard/B450-A-PRO-MAX/support

My speccs are:
MB: MSI B450A PRO MAX

CPU: Ryzen 7 3700X

RAM: G.Skill 32GB DDR4 3200MHz CL16

GPU: ASUS Dual RTX 2060 12GB EVO

Can someone with much more experience help me get my BIOS file modded, so I can use my RTX 2060 with ReBar enabled?
I'd appreciate an answer and have a good one guys!

[LL4nc33]

Ok, I now was able to flash the modded bios. The solution was to install the very 1st BIOS version MSI offered for my MB and luckily it was still supporting my CPU. After downpatching from the newest to the oldest BIOS version, I was able to flash the unpatched modded BIOS with the NVStrapReBar module inserted.

Since M-Flash and a prepped USB drive with flashrom didn't give me any good results, I went for the flashback method of my MB.
I prepared an USB drive with rufus and put the modded BIOS onto it and renamed it into MSI.ROM.
After downpatching the BIOS it just installed the modded BIOS as if it was a regular one.

I had to apply my old settings and OC manually in the 1st boot after the successful BIOS update, also once in windows the GPU driver somehow did not get recognized and I had to do a clean uninstall with DDU.

2nd bootup into windows I reinstalled the nvidia drivers and started "NVStrapsReBar.exe".
For the 1st time I saw it was able to load the DXE module and enabled ReSizeBar and also picked the option 15 as size of the ReBar.

I then rebooted for a last time and this is what GPU-Z and NVStrapsReBar.exe shows me now:

I hope this was some kind of help, even tho I managed to find a solution myself haha