Saurik, the developer of Cydia, Cycorder, and many others who have successfully moved the old MobileFinder version 1.1.4 to firmware 2.0 and above. A similar MobileFinder in AppStore can also work with files, but does not have access to the root, in consequence of which is not in a position to harm the file system iphone. Thus, this program is a full-fledged file manager on the phone with the reservations that have to use it carefully. I encountered only one problem is that your settings are not saved when you exit the application. If you opened the file system, you will need to re-enter these settings the next time you start the program.
The program is installed from Cydia.