The upgrade process was failed when I was trying to update my iPhone 6 Plus to iOS 8.1 early this morning. I had to manually download the image and install it on my iPhone via iTools. I can restore content stored on iCloud backup, such as photos and notes, but I couldn't get back my text messages and voice memos, which are important for me. How to recover my lost messages? Cn any recovery app do the job for me? I am curious about that.