I have been using Wugfresh's Nexus Toolkit since the original Nexus. It is very simple and issue to use. On his website, there are also videos various videos on it from root junky.
Hashcode is now starting to look at porting his SafeStrap onto the S4. It may work for the the different S4 versions. You can read through the thread. There may be light at the end of the tunnel for the S4.
For any users on the 08/06/2015 build, the stagefright application has been updated. It's come to my attention that Google forgot to include some of the patches in the android-5.1.1_r9 tag. As a result, it shows vulnerable on stock LMY48I as well ...
Wow, this setup is great. I just told my wife that my phone is now perfect. :D I wonder how long it will last?
For "how long it will last", are you referring to the wife or phone. LOL
I would be very cautious of any Type C chargers and cables. I have learned a lot from reading the reviews and google posts from Benson Leung. He keeps a list of devices and cables that he has tested.