A popular site for TV technicians. Search for the " Sharp LC-40M500M " dump file.
You cannot install a "Flash Dump" via USB. You must use an external programmer like the RT809F or CH341A to flash the Winbond/SPI chip directly. Download FLASH DUMP SHARP 40M500M rar
Always save a copy of your original (corrupted) dump before overwriting it. A popular site for TV technicians