"I lost all my PDF files stored in iBooks when upgrading iPad to iOS 9.3.2. Have backed up to iTunes on my computer but can't find it. Not on the iCloud as far as I know. How to recover the lost PDF on iPad?"
Lost PDFs on your iOS device? If you are looking for PDF recovery for iPad, iPhone or iPod, this content is exactly what you need. You will learn why the e-Book PDF files in iBooks are lost, and 3 workable methods to restore PDF files from iPad, iPhone and iPod touch.
There are few introductions on the Internet to tell you how to successfully recover a PDF from Apple iDevices. We sum up the methods from users reports that are mostly workable. Try any of them until you succeed.
All the methods apply to iPhone 7/SE/6s/6s Plus/6/6 Plus/5S/5C/5/4s/4, iPad Air/mini 2/mini/4/3/2/1, iPod touch 5/4.
Data loss on iPhone or other devices happens frequently, and mostly the PDF files (including the non-iBooks Store book) are lost due to the following reasons:
There is a shortcut you can try to find you missing PDF files, and some users reported that it works for them.
If you have turned on Sync Collections, you can find lost PDF on another iDevice. For example, if you lost PDF in iBooks on your iPhone, you can find back the same PDF on your iPad.
This is because the Sync Collections makes the iBook keep your PDFs (and non-iBooks Store books) in the same collections across all your iOS devices and Mac. Like if you have the same PDF on all your devices, when you move the PDF to your Sci-Fi collection in iBooks on your iPhone, that PDF will appear in your Sci-Fi collection the next time you open iBooks on your iPad. And if you delete a copy of PDF from iPhone, it will still be on your iPhone.
Backing up data is always a very important thing you should do. We have dedicated a hot article to show you: How to Backup iPhone,iPad, iPod Data including PDF in iBooks. You can choose to backup iOS data to computer or to iTunes.
If you have backup file (no matter whether it is the iTunes backup or the computer backup), you can try iPhone 5 Transfer to restore lost PDF files from backup. It is easy to do.