Since you are looking for Part 4 specifically, you likely already have some parts. To avoid corruption, ensure:
While specific board firmware is usually found on tech forums, you can check the Sanyo Support Page for official general updates. 2. Extracting the Multi-Part Archive Download CV338H A42 1366x768 SANYO USB part04 rar
To download and use the file, you must ensure you have all other associated parts (Part 1, Part 2, etc.) in the same folder before extracting them together to obtain the single firmware image. 1. Download All Parts Since you are looking for Part 4 specifically,
Use a tool like WinRAR or 7-Zip . Right-click on Part 1 only and select "Extract Here". Extracting the Multi-Part Archive To download and use
until the progress bar reaches 100% and the TV restarts.
Copy the single extracted firmware file (not the .rar parts) to the root directory of the USB drive. Update TV: Power off the TV and unplug it. Insert the USB drive into the TV's USB port.
Every part must come from the same source to ensure they are versions of the same split archive.