Windows 7 AIO 64bits R7 on MBPR 12,1 without bootcamp

[user97908]

Hello,

I'm now looking to install Windows 7 AIO 64bits R7 on my Macbook Pro retina 13" early 2015 : 12,1.
Now my config is El Capitan with a partition for debian that i run with an external refind usb stick (don't ask me why).

As I heard (this 43 pages post) latest windows version need some bios emulation to work (or some PCI config crack), so i'm looking to setup earlier versions for now.

I'll try to and update here. For now, i tried to burn the image on USB stick and boot on it. It's not working.

material :

-Windows 7 R7 iso
-32GB USB STICK
-MBP R 12,1 (macbook pro retina early 2015 with el capitan)

What i've done for now :

1.

sudo diskutil unmount disk1
sudo dd if=/path/R7.iso of=/dev/disk1

.. (10min)
Boot with alt, no "Windows" show up

2.

hdiutil convert /path/R7.iso   -format UDRW -o /path/R7.dmg
sudo diskutil unmount disk1
sudo dd if=/path/R7.iso of=/dev/disk1

.. (10min)
Boot with alt, no "Windows" show up

Problem n°1 to solve :
-How to create a windows 7 bootable USB stick for mac

Any ideas ?