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.
I 'burnt' my usb using dd but I couldn't convince the laptop to boot from it. 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. My friend had an issue with her windows laptop and she asked me to help.
