Press and hold the on the TV (not the remote) and plug the power cord back in.

: Download all parts (Part 01, Part 02, etc.) into the same folder. Right-click the first part and use a tool like WinRAR or 7-Zip to "Extract Here." This will merge them into a single .pkg or .bin file.

Release the button once the "Software Upgrading" or progress bar appears on the screen.

Reliable firmware for these boards is typically hosted on technician forums rather than official manufacturer sites. You can often find them at: KenotronTV (Requires registration/membership).

Insert the USB drive into the TV's USB port (try the USB 2.0 port first if available).

If you are downloading a firmware package split into multiple parts (like part01.rar ), follow these general steps to prepare it for your TV:

: Copy the extracted firmware file (e.g., allupgrade_5510_xxx.pkg ) directly to the root directory of the USB drive. Do not put it in a folder. Installation via USB : Turn off the TV and unplug it from power.

: Wait for the process to finish (the TV may restart automatically). Do not turn off the power during this process, as it can permanently brick the mainboard. Where to Find Downloads