So I got an HTC Hero today and when I went to check my voicemail for the first time it said there was an update. So I told the phone to download it and when the install popped up it said it couldn't because it didn't come from the android market or whatever. So I changed the options to let any program install. I went to download again but had to cancel. Then whenever I went to voicemail it just said canceling indefinitely, so I powered my phone off and then on again and went back to voicemail, it asked me to update again but it's stuck downloading and won't finish. What should I do?