I think it's pretty much standard now after viewing all the feedback and bug reports on the unofficial ROM Update for the Mogule that Error #328 is due to a driver issue in Windows Vista. Those wanting to update the ROM on a Vista Operating System should take note of this PPCGeeks Thread Post #38:
Ok it appears that most people having issues running the new ROM update are running Vista on their computer. This is my attempt at a HOW TO. Once you have uptained a copy of the new ROM get this first
GetSPC which will help you get the MSL for your phone because, the ROM erases your number or MDID info. Then follow these instuctions
Vista ROM Update to update your Vista Operating System on your computer with the drivers needed to do ROM Updates. Once you have followed these instructions you should be able to flash the ROM with no problem, one tip though you may need to reboot your computer before trying to flash the ROM. Give the ROM enough time to flash to your device. Once youur update has completed let all the Sprint customizations install. Then do another hard reset of the device. After that take the battery out of your phone and write down your phone's hex ESN. Transfer the GetSPC cab file to your phone and run it. Onnce the program runs in the Input feel put your ESN in and click ok. Your MSL will appear in the Output field. Thats your MSL. Now go to your phone's dial pad and dial ##778# and click dial. When the ESPT window appears choose Edit. Your now prompted to enter your Unlock Code so go ahead and enter your MSL and click ok. In the lower left corner select View Info and then select NAM Settings. In the Mobile Directory Number field enter your cell phone number., Then in the MSID field enter your cell phone number. Now in the menu option click ok. Then press ok to reset your device. You should be up and running. Thats my attempt at a HOW TO for Vista Users good luck.