Because the firmware is provided in multiple parts (like "part3.rar"), you must download (Part 1, Part 2, etc.) into the same folder before extracting them.
If you are looking for specific repair guides, technical enthusiasts often share resources on platforms like Scribd or specialized electronics repair forums. CV338H-A42 LED TV Control Board Specs | PDF | Hdmi - Scribd Download CV338H A42 1920x1080 Aiwa part3 rar
screen to appear. Do not turn off the power until the progress bar reaches 100%. Because the firmware is provided in multiple parts