If you follow the instructions step-by-step it should work without issue. I have done this on many different computers, and never had a problem on any device. Make sure your file is named correctly and make sure you put it in the right place.

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-Michael
Need help setting up your i730/i830 or other WM2003/WM5 Phone, as well as the other hacks I have done, check out the MRailing Guides and Links