HP Omen 15 - ACPI Bios not compatible error during Windows 7 install

[Anthony222]

Hello.

I read and tried everything I was able to find about the ACPI BIOS error- without any success. I have installed Windows 10 but I need second Windows 7 on other partition. Notebook has SSD 256GB (Toshiba). Always during install from USB stick I am getting the blue screen with "ACPI error BIOS version not compatible.....".  This is during "Starting Windows...." screen so I suppose that problem is not with USB3 drivers. Same happens when I try to install Windows-7 from Windows-10 even if I choose the HDD.

What I tried so far (without sucess):

- updated BIOS from F.08 to F.17

- downloaded new Proffesional Windows 7 (with Windows ISO Downloader)

-  add SSD suopport in the install image (https://www.youtube.com/watch?v=EQj0yM1Vnbk     Add NVMe driver support to Windows 7 Installation, KB2990941, KB3087873)

- tried also adding the USB3 support to Win7 install

- Legacy Support option in BIOS is Enabled

Does anyone had sucess with this? It seems that for Lenovo with similar HW it have been possible to install Win-7.

The notebook came with BIOS F.08 with date 09/29/2017 - would it help if I rollback to an older BIOS version?

Thanks.

[Lil_Boy_Blue]

Hi

Maybe....?

http://www.tomshardware.co.uk/answers/id-1912310/windows-supports-uefi-secure-boot.html