Finding a specific firmware backup like the usually requires access to specialized TV repair forums. These files are often uploaded by technicians to help others recover "bricked" televisions or replace faulty SPI Flash memory. Likely Sources for the Dump File

"TSUMV59" firmware 1920x1080 panel [Your Panel Model Number]

: The most comprehensive database for TV dumps (VST59 is a common universal board). You will need to pass a technical quiz to register and download.