

Install Windows 10 into a newly formatted volume.I have downloaded the latest Windows 10 (Version 21H1) iso file. I have no problems EFI booting the USB Windows installer, but I still want to install Windows to use the BIOS boot method. I have always assumed the Windows Support Software, supplied by Apple for my Mac, was designed only for the legacy BIOS boot method of installation.

Apple did not officially start supporting this method of booting Windows until after the 2011 model year.

Staring in 2015 Apple starting omitting BIOS code from the firmware which ended the ability to BIOS boot from any type of drive.Īpple does not support Boot Camp Assistant installations of Windows 10 on 2011 and earlier iMac models. No Mac models older that 2011 can BIOS boot from an USB drive. The only 2011 Macs which can BIOS boot from an USB drive are the MacBook Air and Mac mini models.

User fdmillion's answer requires a Mac that can BIOS boot from an USB drive. Note the following regarding fdmillion's answer to this question
