Hackintosh USB not booting up

I am trying to create my first Hackintosh and I already created the USB. But it won't show up when I try and choose it from the bootup options. I have a Latitude E7270, and it won't show up. I have tried to create the USB a couple of times now but still nothing. Does anyone have any tips??

submitted by /u/CesterCheato
[link] [comments]