@infuscomus
Maybe its really the ACPI Problem.
I did not make a new installation. I just tried to replace the 3 ACPI.sys files in an existing Windows 7 Installation (VHD File), but it did not work.
Is this not possible?

Now i tested replacing the files in the boot.wim from the Installation Stick, and at least the Setup started.
I also tried to replace the files of the install.wim. Had to change the "permissions" to be able to replace the files.

I did not install yet, but maybe i try soon when i kno where to install it to

EDIT: Still cant get it working. Setup is starting when i replace the acpi.sys, but i think it freezes after loading the setup. I thought thats just because of the USB Keyboard is not working, but i also have an PS/2 Keyboard, and still nothing happens.

@VelleX
Use this.
<USB 3/XHCI driver stack for Windows 7/Vista>
https://forums.mydigitallife.net/threads...-7-vista.81934/

@alan2350

I already integrated other USB drivers from canonkong. The strange thing is, that the Setup is loading, but when i have to choose the Install language, it seems frozen. I already have an PS/2 Keyboard connected too, but still nothing happens, so i dont think it just does not recognise the USB Ports.
I remember with the older BIOSes and the 3700X, setup was loading normally, and i was getting a message that a device driver is missing, so no drives showed up. But now it seems just to be frozen.

Maybe i try the other drivers later too, but i dont think it will work

@VelleX try watch this video. There russian language, but its not important. Just follow step by step and maybe you will find solutions. This guy showing 3 methods for install win7 to R9.

Zitat von FlyToha im Beitrag #454

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@VelleX try watch this video. There russian language, but its not important. Just follow step by step and maybe you will find solutions. This guy showing 3 methods for install win7 to R9.

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@User32
@FlyToha

Yes, i watched that Video too. Don't even know where it was posted, but it was on my Watchlist.
The Problem is just, that after exchanging the acpi.sys, the Setup is loading, but stucks on that screen, even with PS/2 Keyboard.
So i dont think its just because of USB drivers, because it should still work with PS/2 Keyboard.

to avoid integration bullshit, just download AMD Chipset drivers, run the installer it will unpack it somewhere in C:\ then just copy the whole folder to the hard drive you'll be installing win7 to.
when installation prompts for choosing driver, give it a location on the hard drive (if it does not find automatically you'll need to figure out which driver your system needs and select it manually)
e.g. on a FX9830P APU i navigate to Bolton subfolder and first choose USB controller driver, it updates and prompts once more, this time you choose USB root hub driver and installation continues

Zitat von VelleX im Beitrag #456

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So i dont think its just because of USB drivers, because it should still work with PS/2 Keyboard.

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@karmic_koala
With a clean Windows 7 Installation Stick, i cant even start the Setup because of a BSOD. I have to replace the acpi.sys for the Setup to work.

@infuscomus
of course the PS/2 Keyboard is plugged in all the time. I already can use it so press F11 Key for the Bootmenu to show up.

@VelleX:Do you have the opportunity to test Ryzen 2000 with your Motherboard?

I managed to successfully install win7 from a usb stick with integrated drivers on MSI B550-A PRO, 5600x, nvme and MBR/CSM. I did not experience any BSOD's but I had other situations like setup hanging on Starting Windows, nvme not recognized e.t.c. I don't know if it works if you use UEFI, I didn't try. Below is the method that worked for me
In BIOS all I had to do was enabling CSM, and choosing a correct boot option (not UEFI). Also updating the BIOS so it atleast sees my CPU. Running on AGESA 1.1.0.0 Patch C BIOS now
As for the win7 image I grabbed a MSDN win7 SP1 image and integrated drivers and SHA256 patch using NTLite from the first post of this thread. In NTLite I integrated drivers into all of the items (not sure if this is important): boot.wim (PE), boot.wim (Setup), winre.wim
Then I used rufus with MBR and BIOS (UEFI-CSM) options to prepare usb stick
Everything worked properly during installation: usb mouse and keyboard plugged into usb3.0+ ports worked and nvme recognized
After about 2 weeks of using the system I can say it's stable and all USB ports work, no unknown devices in device manager
The only weird thing is that I don't see the processor in device manager. But it doesn't seem to influence any benchmarks or prevent any games from running so whatever
Hope this wall of text helps someone

Thanks canonkong for the drivers!

@Mr_Nobody

No, i dont have an 2nd Gen Ryzen to test.
As i wrote, with 3rd Gen ryzen and the older BIOS it was working, just with newer BIOS versions it does not work.

Maybe it would need a different patched acpi.sys

Zitat von Kert im Beitrag #461

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I managed to successfully install win7 from a usb stick with integrated drivers on MSI B550-A PRO, 5600x, nvme and MBR/CSM. I did not experience any BSOD's but I had other situations like setup hanging on Starting Windows, nvme not recognized e.t.c. I don't know if it works if you use UEFI, I didn't try. Below is the method that worked for me
In BIOS all I had to do was enabling CSM, and choosing a correct boot option (not UEFI). Also updating the BIOS so it atleast sees my CPU. Running on AGESA 1.1.0.0 Patch C BIOS now
As for the win7 image I grabbed a MSDN win7 SP1 image and integrated drivers and SHA256 patch using NTLite from the first post of this thread. In NTLite I integrated drivers into all of the items (not sure if this is important): boot.wim (PE), boot.wim (Setup), winre.wim
Then I used rufus with MBR and BIOS (UEFI-CSM) options to prepare usb stick
Everything worked properly during installation: usb mouse and keyboard plugged into usb3.0+ ports worked and nvme recognized
After about 2 weeks of using the system I can say it's stable and all USB ports work, no unknown devices in device manager
The only weird thing is that I don't see the processor in device manager. But it doesn't seem to influence any benchmarks or prevent any games from running so whatever
Hope this wall of text helps someone

Thanks canonkong for the drivers!

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x399, x570 system should work without any acpi patches.

pls help me
i try install win7 on ssd nvme samsung pm981 but can't not completed
Window crash in Starting Window and so many lag , pls help me :(
i'm using r5 2600 and b450 steel legend