Too late, I gave a try. N9 doesn't boot up anymore (with or without usb connection), it keeps rebooting until "Device not working properly" message and sometimes it comes to "charging" icon when I connect it to USB no matter flasher is running or not.

I can't flash it because it does not boot to "flashing" mode, so flasher doesn't detect it and stays on "Suitable USB interface (bootloader/phonet) not found, waiting..." stage.
I have tried on Ubuntu 14.04 and Windows 10 (also tried different USB ports) with the same result.