So, I went to go manually change my mail icon, and using iFile I replaced the standard "Icon@2x.png" with my custom "Icon@2x.png", deleted the icon cache, and respringed. I had also changed Safari's icon, and I'm having no issues with that. However, the phone seems to act as if the Mail app never even existed. The app is COMPLETELY gone. "Mail, Contacts, and Calendars" is missing from settings, using Spotlight to search for it produces no results, and attempting to send an email via another app simple opens up settings. I'm an experienced jailbreaker and I did know what I was doing, so I'm heavily confused as to why simply changing the icon caused the entire app to disappear? I double checked to make sure I was only replacing the icon. Is it possible to get a reupload of the mail app from an A1429 iPhone 5 running iOS 7.0.4? Should I just go ahead and reinstall iOS completely? Or is simply the naming of the icon ruining everything? Thanks for all the help.