Updateing TMOBILE NOTE 4 To 5.1.1

Hi,

I have a few questions regarding updating my T-mobile Note 4 (SM-N910T)

And have not yet received the 5.1.1 update I'm on 5.0.1.

So if I do this manual update will my warranty remain?

Is it safe?

Will my phone still be official stock?

Will I be able to use automatic updates in the future?

Thanks.