Redmi 2014818 says "unfortunately com.android.systemui has stopped"
Solved it myself. 
1. Downloaded update. 
2. Renamed it update.zip. 
3. Pasted it in sd card "in" the phone from another "in" the phone folder using RAR app. 
4. Used power and volume button etc (in followed recovery instructions). 
6. Did it. Much relieved .