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  1. @infuscomus Do the following to test the Win8 XHCI drivers on Win8.1: - Create a bootable Win8.1 x86 USB flash drive using Rufus. - Open boot.wim in 7-Zip. - Replace the following files in folders \1\Windows\System32\Drivers and 2\Windows\System32\Drivers ucx01000.sys, usbd.sys, usbhub3.sys and usbxhci.sys -> original, untouched from Win8.0!!! Ported drivers will crash. - Restart and boot from it. Worked just fine here. If USB devices work, your issue is related to the ACPI driver.
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