How can i install Windows 7 on Thinkpad X1 Tablet Gen 3 ?

Hi all,

i do have a Thinkpad X1 Tablet Gen 3 intel Core i7 8650U 8Gb Ram NVMe SSD M2 Disk with two only USB-C connectors, it's Class 3 Pure Uefi Bios with No CSM neither Legacy Bios, it has been deleted by Lenovo in July 2020. it's very sad news because i know without CSM it's very hard to realize this challenge

im dying trying to install Windows 7 x64 i got an Acpi Error BSOD at start. i can figure out the pb of recognizing the usb 3.0 & nvme drivers, but my big pb im looking for a compatible version of the Acpi.sys file to get ride of this dam'n BSOD

Or any way to recover These old good Bios Modules (Legacy & CSM) ? The X1 was designed in Early 2018 so before deleting these modules in July 2020, i presume that old versions of Bios firmware do have these modules present, but they denied downgrade firmware !

So please anyone do have Thinkpad X1 Tablet Gen 3 with these Bios CSM & Legacy Modules present can help me

Thank you in advance for any idea or suggestion