Hello, I have got a MacBook Pro 2015 Retina. About a week ago I created myself a external HDD with Windows To Go. The HDD booted perfectly on my older MacBook Air (2014) and MacBook Pro (2012 non-retina), but it didn't boot on my MacBook Pro (2015). Today I checked that my MacBook Pro does not even boot original Windows 8 DVD and original Windows 7 DVD, it doesn't even boot bootcamp created Windows Install Pendrive. When it comes to USB external drives they do not even show up on bootable devices screen. However, the Windows DVDs showed up on the bootable devices screen (Press option/alt when booting), but when I clicked on them the Mac booted into macOS. How can I solve this?