Q: hi everybody,I have problem for updating my iphone ios6 to 7

Care to state the problem or issue.

we aren't mind readers here

Not unless you provide more details about what the problem is. We could guess, but there are hundreds of possible reasons you might have a problem updating.

http://support.apple.com/kb/TS3694

It sounds like you are trying to install a version other than 7.0.4. Can't be done. Or you have a pirated beta version on your phone now.

If you restored a backup from before those recordings were made, and you never backed up your phone to iCloud or your computer after you made them, they are gone forever.

You don't need to know where it is because iTunes knows, but this tech note shows the location of the backup for different operating systems. http://support.apple.com/kb/ht4946

It isn't a file; it is a folder with several thousand files organized into a SQLite database. There are a number of backup extractor programs available; a web search will help you find these.