I tried clicking 'software update'

http://1drv.ms/1fJ5B3h (short video showing steps I've done)


Navigate to the Home screen then tap All apps > Settings > About > Software Information and locate the Software version. If your Software number is less than 5.18.502.1, you should proceed with the upgrade.

I tried updating via 'HTC sync'

enter image description here

This phone belongs to my employer and I was advised agains breaking the warranty. So the recommended / official way of updating software is preferred.

I tried inserting another (not AT&T) SIM and it tells me that it is locked. Is that a case that software update doesn't work without the SIM?

  • What happened when you tried to upgrade without the SIM? – bobbyalex Apr 29 '14 at 2:23
  • @BobbyAlexander - see the video (link on top of the question). I keep pressing 'software update' and nothing happens. – Mars Robertson Apr 30 '14 at 13:16
  • Did you try updating from the phone directly? – bobbyalex May 2 '14 at 6:48
  • I'm sorry, I'm afraid I don't understand the question: i.imgur.com/1TWArne.png – Mars Robertson May 2 '14 at 9:38
  • In your phone settings, there will be an option to perform an update. Try that. – bobbyalex May 3 '14 at 11:29

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