I also read one suggestion about going into the BIOS/UEFI setup and changing the boot mode from UEFI to CSM, but that option is nowhere to be found.Īlso worth mentioning I am making sure that Windows 8.1 is completely shutting down by using the Shift key method. I've even tried changing the boot order in the BIOS/UEFI setup. When I turn on the laptop, I'm hitting F12 to get the boot selection menu and after I select the DVD or USB flash drive option, it just goes on and boots from the hard drive into Windows 8.1. I've verified another PC will successfully boot both the DVD and USB flash drive, so I know they are not the problem. I've turned off secure boot and tried both from a DVD and from a USB flash drive. I'm stuck at not being able to get it to boot the installation media. I'm trying to downgrade a Toshiba Satellite C55T-A5123 that came with Windows 8.1 on it to Windows 7 圆4 bit.
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