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How to unlock my samsung galaxy 4 screen?

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This operation requires that you perform a factory reset. The factory reset operation wipes all the settings and applications installed and removes any pattern locks. The storage device will remain... 
i do as such as you explain but there is no any feed back my my problem till as it is  
This is very easy. You must have internet connection to solve this problem. You go through emergency call and activate wifi. Then you give your google ac. Linnas.  
1- switch off the phone... restart while holding , volume DOWN , home and power button pressing and holding together for around 4 to 5 seconds... phone will go to recovery mode... select factory... 
Luv yu dude... Yu solved the problem... Em enjoying but now my new problem is its charging problem...  
RAMDUMP MODE Cause: Force Upload I do as you say and found these two letters above and chane nothing then.I use galaxy s+ I9001. Advice me how can I do then  

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