Create bootable USB disk with Bootcamp 6

I have OS X El Capitan with Bootcamp 6 in an Early 2015 Retina Macbook Pro. I want to create a bootable USB disk with Windows 10 to install it and then completely remove OS X. I have read different answers:

• Can i remove OS X completely and install Windows?
• Creating A Bootable USB Of Windows 8.1 On OS X?
• Bootable Windows 7 USB won't boot
• How to Create a Windows 10 Installer USB Drive from Mac OS X

But I can't get my USB to show when booting and pressing the "Option" key, only my external disk with the Time Machine backup and the internal SSD is showed. I tried using Bootcamp to create a USB disk as shown here:

But with Bootcamp 6 it just asks me for an ISO and then proceeds to repartition my disk, I can't create a bootable Windows disk. I also tried using RUFUS to create a bootable Windows USB disk but it is not detected neither. Any solution or alternative?

Solution 1:

Solved it! I created the bootable USB with Rufus, just select the Windows ISO and format the disk as FAT32. The partition scheme must be MBR Partition Scheme for UEFI if you select compatibility for both BIOS and UEFI-CSM it won't be detected on startup.