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Hi,Thank you for using Just Answer my name is Carl and I will try and help with your question.I am sorry to hear you are having trouble, do you use the samsung kies software? Within the software is an option to replace the phones firmware if you are having trouble with the phone. I think this would be the best thing to try but it could remove data from the phone like photos and contacts. If the phone is still working ok I would back it up first in the kies software.The kies software can be download here.http://www.samsung.com/uk/support/usefulsoftware/KIES/JSP