Hello, I have encountered a problem. I have tried to follow exactly the procedures in "downgrade windows 8 to windows 7" and the tutorials about uefi windows 7 installation. After I have created an UEFI bootable USB, I could only boot into the usb by enabling the CSM(and ofc disabling secure boot). I have successfully installed the windows 7 professional. But I have noticed that the PC is now using legacy bios to boot, and when I attempted to disable CSM(i.e. to go back to uefi bios) and boot, an error message prompted and stated"an error occured while attempting to read the boot configuration data" error 0x00000d. I know this question may have been posted before. Anyone can guide me to any link or give any advice?
- Windows 7 Pro