Canon LBP7780CX User Manual page 537

Edit the downloaded config file in "TextEdit" or a similar text editor.
For details on descriptions of each option, see
7
Enter "put <the file name> CONFIG", and then press [return] on your keyboard.
Enter "CONFIG" as all upper case characters.
The edited config file uploads.
In <the file name>, enter the name of the config file that was entered when the file was downloaded.
8
Enter "get reset", and then press the [return] key on your keyboard.
When the printer is restarted the settings will be enabled.
After checking that the printer has restarted, press the [c] key while holding down the [Ctrl] key, and return to the ftp
command prompt.
9
Enter "quit", and then press the [return] key on your keyboard.
10
Enter "exit", and then press the [return] key on your keyboard.
11
Select [Quit Terminal] from the [Terminal] menu.
"Setting Items."