While downgrading you will get the “iPhone Could Not Be Restored due to an Unknown error from iTunes”.The first step is to follow the downgrade iPhone and iPod Touch to iOS 3.1.x here.Please make sure that you have SHSH blobs saved with Cydia or TinyUmbrella before embarking on this downgrade and 1015 iTunes error fix guide. The 1015 error usually occurs at the end of the downgrade process when you are ready to reboot your device. This error occurs when you try to downgrade your iPhone from iOS 4.x to older firmware versions like 3.1.2 or 3.1.3. IPhone 3G and iPhone 3GS owners must be familiar with 1015 iTunes error.
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