I have downloaded an update for my ipod 4th, and after that all my songs, pictures and apps have been erased, Is there some way to recover all my information without have done a security copy?

I have downloaded an update for my ipod 4th, and after that all my songs, pictures and apps have been erased, Is there some way to recover all my information without have done a security copy?

I supsect you did the update on other than your syncing computer. If yu did the app, music and synced photo will not be on the iPod after the update since those items are not in the backup that iTunes makes. See:
iOS 5: Updating your device to iOS 5
The above applies to all updates performedvia USB on a computer. To get stuff back, restore from backup on the syncing computer.
The above in my educated guess since you provided litle information about how you did the update.
You can redownload many iTunes purchases by:
Downloading past purchases from the App Store, iBookstore, and iTunes Store

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