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I did a software update on my iPhone 4 this morning and it did then attempted to restore itunes then came up with an error and said it was unable to restore the phone. The phone was then off just with the itunes icon and asked me to plug it in. I left it plugged in for hours and it eventually did restore but it only restored up tp October 2011 leaving 8 months of data missing from my phone!!!!! I have lost phone numbers, photos, calendar and apps!!!
I had this problem to. You have to do it during the day so you can watch it. And it could most likely be because of your internet. When you update, make sure nothing else is using the internet. And if you have an apple id then your contacts should be synced with your account.
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