Any help on this S6 phone?

I picked up this GS6. Here is what is on the about phone:
Status
Legal Information
Model Number: SM-G9200
Android Version: 5.0.2
Baseband Version: MOLY.WR8.W1315.MD.WG.MP.V34
Kernal Version: 3.10.0-2828982
se.infra@SEP-136 #1
Tue Jul 28 10:17:25 CST 2015
Build Number: KTU84P.N9100ZCU1ANIF
Custom build version:I9296_FW_A.B-V4.0_0804

Now one thing I noticed in the about phone section is that there is no update button. What I want to do is be able to root this or update the OS on it some way. I've tried Smart Switch and Kies 3 and neither can detect the phone. My computer can detect the phone so I have access to the phone via the comp. Any help or ideas would be appreciated. Thank you.