I don't understand mode plunge.

Does this mean that your unit is working?

By reset,normal movement is possible.
The xcf downloading from a PC is possible normally,too.

To do a forced update, you need to run the updater while remote is connected to the PC. Then, use the hard buttons to do a reboot. (Home, Menu, Page Up). Before the Philips logo comes up, I think you need to hold Buttons 2, 3, and 4 simultaneously below the screen.

I've never owned a 9300 so I am guessing here based on how the other models work.