Please provide your TV model number or panel type so we can help you find the exact firmware match.
This blog post provides a comprehensive guide for technicians and DIY enthusiasts looking to repair or update their using the JUC7.820.00229436 firmware. Download JUC7 820 00229436 1920x1080 Changhong part5 rar
Copy the extracted .bin file directly to the of the USB drive. Do not put it inside a folder. Step 3: Installation Process (Reflashing) There are two common ways to initiate the update: Method A: The USB Boot Update (For "Dead" TVs) Turn off the TV and unplug the power cord. Insert the USB drive into the TV's USB port. Press and hold the Power button on the TV (not the remote). While holding the button, plug the power cord back in. Please provide your TV model number or panel
Firmware files for these boards are often split into multiple parts (like part1.rar through part5.rar ) to make downloading easier. Do not put it inside a folder