I can definitely help you with a guide for that file. Before we dive into the steps, I want to make sure I'm giving you the right advice, as there are two ways this file is usually handled: :

: Are you just having trouble extracting the .rar file (specifically "part2") because it's part of a multi-volume archive?

Could you clarify which part you need help with? Also, it's worth noting that using the wrong firmware can permanently "brick" your TV, so double-checking the for the exact model number is a great first step!