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iOS Device (Mine is 4S, may work for other devices too)
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Windows 10
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Latest iTunes
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Go to "C:\Windows\System32\drivers\etc"
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Right Click on the file called "hosts"
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Paste anywhere you want
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Plug your iPhone to your Computer
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Open iTunes
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Try restoring, 100% Worked for me.
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Move the "hosts" file (you moved in step 2) to "C:\Windows\System32\drivers\etc" after restoring your iPhone.
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Thank me later.