Did you buy the phone new? If it came from a T-Mobile account and then was reactivated on Sprint i can see where the update process would be confused and fail. You could try the OTA route, but OTA's are from one specific version to another. I would be wary of going from a T-Mobile version to a Sprint version with an OTA. I would recommend flashing the firmware from a factory image. From that point forward you should get the OTA's as long as you are stock and not rooted.
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