Hi and welcome to iMore.I'm not really sure what an unauthorised Apple Store is. Do you mean a fake Apple store or just a generic store that also sells and repairs Apple devices?
I would guess they made a bodge of the install. Personally, if I needed something major doing like that, i would always take it to a real Apple store as I don't trust anyone else, not even myself, to do a good job.
When you say shake, can you be a bit more specific please? Do you mean the screen is physically moving inside the device or just the on-screen contents? I have never heard of this occurring before, I have to admit.
05-30-2014 08:56 AM