Default [Q] Few quick questions about my newly rooted gs4

Recently I was able to make straight talk work through my Sprint GS4. I had to flash to mdc to make it work.

Here are my questions:

If I want to update my phone through official FW updates, will that reset anything I have done to my phone? There is mk2 update in my status bar that has been there forever. Can I install it, or if not, is there a way to remove the icon from the status bar?

Also, being a Sprint phone, another icon is in the status bar that always tries to "activate my device", is there any way to have this removed from the status bar?

Thanks!