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Downgrade Alienware 17 R4 to Windows 7

Hello Guys

I'm trying to Downgrade the Dell Alienware 17 R4 to Windows 7 and like i'm having the same problem i had downgrading the XPS 8910 and The Alienware R5.

With the XPS 8910 and Alienware Aurora R5 i solved the problem Downloadin by dell the following ISO of WIndows 7: G13K9_PW4KGA00_W7SP1PRO64_ROW(DL)

This ISO it does not work on this Laptop(Alienware 17 R4). Basically when start  the system with Windows PE it does not recognize the USB port so it lose the Installation media.....

I tried to Inject these driver into the boot.wim

Chipset_Driver_JWGWH_WN_v6.1.7601.28099_A00

Chipset_Driver_PVR15_WN_v8.1.0.1252_A00

Chipset_Driver_TW4VR_WN_v1.0.4.220_A02

Chipset_Driver_YC5PN_WN_v9.3.0.1019_A00

But nothing has change when i start the Installation of windows from usb key...i lose the of usb ports and so  the media with the installation of Windows....

I have to add the driver also in the Install.wim? There is the possibility to download the CAB drivers?

Tanks in advance for any HELP

GIO