Wich could be the use for my tv?

[pepitopepito]

Hi,
I have 3 samsung tvs at home. 2 of them have no internet connection options, so I see usable to try to activate new possibilities on them.
But the third tv is:
UE46F6400
software T-MST12DEUC-1113.0,BT-S/G
Firmware 1113 (update possibility to 1117)
I have tried to enter as user: develop/sso1029dev! but the tv doesn?t let me enter the pass. I neither know wich IP to enter to update apps as developer, where do I have to look for this IP?
I see that you suggest not to update FW to a higher one, but as I see, I could update to 1117 without problem. Could you confirm it?
What could I do? which is the use of rooting? Is it possible to add interesting apps?
Thank you for helping me!