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Unfortunately it seems to me that "BT3 64bit Operating System Download" contains a 32bit version of Windows 10. Even if the "installer" boot correctly in the 64bit mode, the WIM recovery image (the one that contain the OS the will be copied on the eMMC) contains a Window 10 32bit version, not the 64bit.
If you need to revert the 32bit: in the "BT3 64bit Operating System Download" mega drive there's a folder called BIOS. It contains BIOS v011 which is a 32bit BIOS. You can flash this old BIOS from the UEFI Shell.
- Put "BLBT3V11.bin" on an USB stick from the BIOS folder
- Get "AfuEfix64.efi" from AMI website. Since now the BIOS is a 64bit version you need the 64bit EFI executable not the 32bit provided in the "BIOS" folder. Put it on the same USB stick
- Boot and enter the UEFI shell, mount the drive (I don't remember the command, I have to check, but if you google you should get some clue)
- From the USB mounted drive run 'AfuEfix64.efi BLBT3V11.bin /p /b /n /x'
This procedure worked multiple time on my BT3, when I was trying to make the "BT3 64bit Operating System Download" working, until I realized that it's a 64bit version instead (it works well with the 32bit EFI BIOS !!) and I had to revert to the 32bit BIOS. Installing Windows 64bit using media tools works great but I was unable to find all the drivers.
PS I had to remove links because the moderation filter. But with google you should be able to find the AMI/APTIO BIOS utility |
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