How to update Galaxy S2 I9100 to latest official firmware Android 4.1.2 Jelly Bean XWLSD: Extract the earlier downloaded firmware zip to get a .tar file along with some other files. Also extract
Boot your Samsung Galaxy S4 into Download Mode : Power off your phone first and wait for 6-7 seconds after display is off. Press and hold these 3 buttons together until you see Warning! screen: Volume Down + Power + Home. Press Volume Up now to continue to Download Mode. Connect your Galaxy S4 to PC.
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