Ipad Air 32 Go: restore problem after iOS 7.1.1 update

Hello,

After over the air update on my iPad Air 32Go : after 18Mo downloading from "Settings"/"Software Update" and automatic restart, suddenly a itunes logo appears...

So I plug it on my macbookpro and launch iTunes: my iPad is détected a new empty ipad !!!: everything is disappeared ....

So I launch restore from backup file but a window appeared and said that some parameters are not compatible with iPad Air. !!!!

After selected continue button to launch restoring: after 5min ( very short when you have 29 Go of backup file of Nov 25 2013: see below !!! )

After auto restart, iPad Air is always empty as new !!!

So how to fix my iPadAir problem and restore it ?

Thank You

iTunes 11.1.5
MacOX 10.8.5
iPadAir 32Go iOS 7.1.1 (before upgrade --> iOS 7.1)