I'd like to share my own experience about Flashing the N9 to PR1.1... I tried many times following instructions that I read in some different forums and I was desesperating about geting any result. So in resume, in my experience, the most important step I did and it work fast was: " Go start menu and press right click at the CMD Flasher Window and choose 'open as administrator' ", and then you ready to type the directory when the flash.exe was installed, in my case "C:\Program Files\Nokia\Flasher\flasher -F FirmwareImage.bin -f" and ready, you'll have no problem