Handy utility for those who have WiFi and don't like to mess with USB cable.
Download any SFTP-client (e.g. WinSCP for Windows) and forget about USB (till the next charging of cause).
Probably you have to set (or change) the root password. You can't connect via SFTP if root password is not set. It's easy to change it:
If the password is not secure enough then you can see warning. It's not fatal.
You should use the following parameters for connection: