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A Windows 10 installer can be manually made using the following steps. Here, the assumption is Windows will be installed to UEFI boot.

1. Use the Disk Utility to erase the flash drive. Use table below to determine the proper choices.

   Option	Value
   Name:	Wininstall
   Format:	ExFAT
   Scheme:	Master Boot Record

2. Mount the Windows ISO file and copy the contents to the flash drive.

3. Use the Boot Camp Assistant to download the Windows Support Software. This should be done on the Mac where you are going to install Windows.

4. Copy the Windows Support Software to the flash drive. If you do this correctly, then the BootCamp directory will appear in the root directory of the flash drive.