I am trying to do a fresh install. USB charging is working when connect to PC but the phone is not recognized (Windows 8.1 OS). Am getting the following error message in phone

"Not enough power from the USB in order to charge the device"

I also check the other thread and it did not work
http://talk.maemo.org/showthread.php?t=84167

After switching off the phone (8 sec hold), started flasher and am stuck with no progress

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D:\Mobile\NokiaN9\Flashing>Flasher.exe -F DFL61_HARMATTAN_40.2012.21-3.335.1_PR_
LEGACY_335_ARM_RM-696_PRD_signed.bin -f -c -R
flasher 3.12.1 (Oct 6 2011) Harmattan
WARNING: This tool is intended for professional use only. Using it may result
in permanently damaging your device or losing the warranty.

Using 1st image to detect HW
Suitable USB interface (bootrom) not found, waiting...
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Can someone help please?