I upgrade ios 4 to ios 5.It is completed but when i try to restore all the apps back up before,at last it's written the apps cannot be found(all the apps).

i upgrade ios 4 to ios 5.It is completed but when i try to restore all the apps back up before,at last it's written the apps cannot be found(all the apps).

The backup that itunes performs does no include any itunes content ( apps/music/vids/etc).
You should have transferred any purchases to your computer.
If you failed to do this, then you will have to redownload:
Downloading past purchases from the App Store, iBookstore, and iTunes Store

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