Stop Galaxy Note 4

I want a help
Galaxy Note 4 model : SM- 910x
I bought it from someone.
It was carrying a lollipop version 5.0.1
Medil : SM- 910f
By mistake you messing Recovery
Restore factory data
Then running Android
Then it did not work
It depends on the Samsung logo.
I have downloaded 5.1.1 sucker Medil system : SM- 910f
But the same problem
Android Word gestartet ...
App 7 von 24 wird optimiert ...
Then stop and re- operation and depends on this letter and re- operating
I want to help
Formal model : sm-910x