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Help Failed to mount efs

My samsung galaxy suddenly stopped working for no reason while charging so I switched it off and the started it up again but when the samsung logo appeared the short musical jingle didn't finish it just cut out sort of two thirds in and just stayed on boot logo. Now after the reset it says failed to mount efs. I have looked at some info on what to do but I'm not sure. I've not tried to root or install custom or stock rooms. Please someone help me ? I have tried adb but it just starts in a window the disappears quickly is this a problem with the version i have or is there something I'm missing. I have kies but haven't tried that because I don't think it will work. Also I have Odin but can't seem to find a stock rom for GT I9300 uk voda. Also my phone takes any so card sim which rom should I download if I need to?
 
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