The first week or so S4 was out I had gotten one and rooted it. Not very long after that a 'System update downloaded - touch to install' has been on my phone. Many many months later I have decided to finally ask if it is OK to go ahead and update my system and if not to the latest update, then to which? And if I can let my phone automatically do it or if I need to be careful.
I'm afraid I don't remember how I rooted my phone. It was a 1-click exe I believe.
Here is some information that may help.
Android ver: 4.2.2
kernal ver: 3.40- Sat apr 27 2013
software ver: L720VPUAMDL
Hardware Ver: L720.08
Please let me know if you need more information to help me.