24-inch (60 cm) HD Ready LED (1366 x 768 resolution). Ports: 2 x HDMI, 2 x USB. Finding the "Dump" File
Go to Menu > Help > System Information to see your current version.
You can find spare motherboards or technical files on sites like AndroidFixCell or LED LCD TV Spares . Download VST59 PA506 Panasonic 24D400DX Dump rar
Loading a dump file requires a specialized hardware programmer (like the RT809F or RT809H). Incorrect firmware can permanently damage the board. Official Firmware Update Alternative
If your TV still powers on but has software bugs, it is safer to use the official update method: 24-inch (60 cm) HD Ready LED (1366 x 768 resolution)
Are you trying to using a programmer, or just looking to update the software via a USB stick?
Official manufacturer websites like Panasonic Support usually provide "update" files (via USB), not raw "dump" files. A "dump" file (often in .bin format inside a .rar archive) is usually found on technician-focused forums or spare parts sites. You can find spare motherboards or technical files
Visit the Panasonic Global TV Download Page and search for the model TH-24D400D/DX.