I updated my iPhone first by downloading into iTunes then installing. Went OK Moved on to update iPad 2. Either I missed it or it didn't offer to download then update. It did the update via wifi. I normally keep @ 6GB free all the time. During the update it went to -0- but finally completed. Started it up only to discover that my 78-80 Kindle books are gone.... Not sure what else, if anything is missing. I did a restore of the backup I did just prior to updating and -0- changed. "Lost" about 75-80 books. Not really gone but it will be a PITA to retrieve again from Amazon and my Calibre libraries...... First time or two I opened the Kindle app it told me the book was missing and to "re-register" the application. No longer does that and I have my @ 6GB of free space back.