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When I format the usb with FAT32, I can see a UEFI entry pressing F12 on the Dell during startup - but now that option is not there. I reformatted the usb on Mac using exFAT and reinstalled the iso using unetbootin - but still no solution Searching for this I found that this file is bigger than 4GB so FAT32 is not an option. Note that official hardware support for macOS 10.13 'High Sierra' is the same as macOS 10.12 'Sierra' that came before it, although not all Macs support. It ALMOST worked - windows installer starts but then complains about "cannot open d:\sources\install.wim 0x8007000d" (hope this reference helps other come to this question) macOS High Sierra USB Installer - An easy-to-follow tutorial to create a bootable USB installer for macOS High Sierra using the respected DiskMaker X app courtesy of Other World Computing. So after some more research I found unetbootin and an howto that suggests to erase the usb and formatting it using fat32 and then "burn" the iso using unetbootin.
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#MAC MAKE BOOTABLE USB FOR DELL INSTALL#
I "burnt" my usb using dd but I couldn't convince the laptop to boot from it. If you are creating an install USB flash drive with Windows 7 for a UEFI computer, you need to perform additional steps: Go to f:efimicrosoftboot folder on the USB flash drive Entirely copy its contents one level up (to the F:efiboot directory) Copy the bootmgfw.efi file to the f:efiboot folder and rename it to boot圆4.efi. I couldn't use Boot Camp Assist (as most howtos suggest) because it didn't show the option to "burn" an USB on my system and I didn't want to install Xcode hoping to change that. Since I have a Mac, most tools to create a bootable USB don't work. The laptop cannot boot properly anymore so I wanted to reinstall Windows from usb. I 'burnt' my usb using dd but I couldnt convince the laptop to boot from it. I couldnt use Boot Camp Assist (as most howtos suggest) because it didnt show the option to 'burn' an USB on my system and I didnt want to install Xcode hoping to change that. My friend had an issue with her windows laptop and she asked me to help. Since I have a Mac, most tools to create a bootable USB dont work.