If you are looking for specific older versions or community-shared files (like the multi-part .rar files you mentioned), these are often found on specialized forums or technical platforms:

: Some technical communities like hashmielecom share various smart TV software files, though these are unofficial.

Using the wrong firmware or an unverified file from the internet can "brick" your TV, making it permanently unusable. Always verify your TV's Chassis Number before attempting a manual installation.