Sorry, missed that question. If you have 4.4, you're better off backing up apps and app data with titanium backup, wiping data/cache/dalvik, flashing 4.5, then restoring the apps you need, only, restoring data only when you need to, then changing settings manually. It's can be a pain, but you'll avoid most conflicts that way. You can *try* just updating to 4.5, if you want, without wiping data, but you might have issues. It's up to you if you want to y try, but if you do have any problems, the first thing anyone will suggest is that you wipe data and reflash. Also, you'll have to repush sprint zone again, no matter what you do, it will get wiped out when you flash a new ROM, whether you wipe data or not.

. After a while, you'll get comfortable with certain things in recovery, such as the (sometimes cryptic) error messages it might throw at you.