How to Un-jailbreak my iPhone 5C with iOS 8?

Also what would happen if I updated to iOS 8.1 with a jailbreak? Would that screw up my phone or no. I want to know for when I'm ready to take it off.

Best luck.
http://www.tech-recipes.com/rx/48665/how-do-i-un-jailbreak-my-iphone-ipad-or-ipod-touch/