I picked these two up from ebay and both were in Japanese and have no option to change languages. Did some research and figured out how to switch them to English. Despite them not being listed on https://www.rockbox.org/wiki/SonyNWDestTool the tool does work. Watch this youtube video (different model, but the concept is the same) and follow the instructions on the SonyNWDestTool page. Once you run the command and safely eject, reset the settings.
To reset the settings on either one the steps/menus are the same:

1. From the Main screen – choose toolbox in the bottom left
2. push up once to get to the bottom of the list and choose that (Common Settings)
3. push up twice then choose that (Reset/Format)
4. Choose what is selected (Reset All Settings)
5. Press left once to select Yes

and now the interface should be in English!