ed are wrote:
... what can i do? i dont want my data to erase and i dont have backup. ..
Once the Device is asking to be Restored with iTunes... it is too late to save anything...
See Here > http://support.apple.com/kb/HT1808
You may need to try this More than Once...
Be sure to Follow ALL the Steps...
But... if the Device has been Modified... this will Not necessarily work.
Restore loop (being prompted to restore again after a restore successfully completes)
Troubleshoot your USB connection. If the issue persists, out-of-date or incorrectly configured third-party security software may be causing this issue. Please follow Troubleshooting security software issues. .
Next try placing in DFU mode and then restoring.
Then try restoring on another computer.
Last, make an appointment at the Genius Bar of an Apple store.