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When you did the Official Sprint Rom, did the upgrade utility show what was going to be upgraded? It should list three things when doing the Sprint update. It should list the Rom, the ExtRom, and the Radio. Did it show these three things when it prompts you to click on upgrade? Did you shut down everything on you computer and make sure the computer and USB connection stayed active? Did the upgrade complete and tell you to do a hard reset to finish?
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