DO NOT MIX THE GUIDES
The guide at life hacker is an abstract of an earlier version of the full instructions.
Follow the full instructions, the ones at the second link in your post.
Be sure both device's are registered, both do not have Special Offers enabled....
That is: Everything about them mentioned in the Bullet List (Step #0) is identical.
Then try the problem device again, report back on what happens (in detail).
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