Everytime i turn it on, it instructed me to connect it to itunes but it keep restarting before it can be detected by itunes within 1 min. Hence, i decided to restore it back to factory settings. Apparently failed on each attemps during Restoring iPhone firmware . Pop up window with "The iPhone "iPhone" could not be restored. An unknown error occurred (1)." appeared.
Is this because of incompatible of iPhone 3GS Hardware with iOS 7?