with a padlock symbol ?
I think this is opcional to add a security lock, get in touch with Sparky thread link in previous post, he has opened one, I've seen similar models.
As you flex the back cover, release plastic tabs that hold the upper part, should remove with little force, I have seen other samsungs but not your particular model, they should be similar in opening, hope Sparky can add more light here.
Frank
Ps: Here's one not the same model but similar construction, hope it helps.
