So I recently purchased a PS4 w/Arkham Knight. After a while of playing it, me and my brother decided to update our PS4 to the latest system version 2.57. I left it at installing and left the room but a few minutes later my brother said the system crashed. So now it doesn't works anymore and we brought it to the store where we bought it from, along with a year's warranty. They said they can replace it and give it to us in 4 days. However, my question is can I again update it because apparently we cannot connect to PSN or play multiplayer games (which we plan to buy) without installing it.