Bought on Craigslist, Factory reset it, Many default apps are gone, Lots of issues?

Hey Guys,

Brand new to XDA and new to messing with my phone in anyway, I looked through some threads, but am not sure if I can mess something up worse by not following the right steps,

I basically bought a used phone on craigslist, AT&T LG G FLEX 2 - LG-H950 and when I factory reset it, many of the default apps are not installed, cannot use my calendar and the phone is just a little off all together.

Not sure if the phone is still rooted or if the factory reset cleared it, and I am all together worried that the only reason the kid sold it to me was because he messed it up and couldn't fix it and just pawned it off to my dumas

I know its frowned upon to start new threads when the answers are out there, but i need this for work ASAP and if I screw it up and cant use it all Ill have to go back to my work iPhone (last resort, i hate it)

I started to follow hyelton's video http://forum.xda-developers.com/show....php?t=2785089

but got cold feet when i couldnt find my exact model the h950

It is currently on the android 5.0.1 and when i tried the update before i reset it, it said i couldn't update it something about the root. So i reset it and everything is the same as when I bought it on CraigList.

How do I get it back to square one, like it came in the box. I am interested in learning how to root and be in control of my own property, but I just want to get back to the start safely without bricking it so I can follow the forums and not feel so helpless.

im sorry if the first response to this just point me to another thread, but I will appreciate even that much guidance so at least i know i am headed in the right direction

Thanks a lot xda community

Branden