Users seeking "updated" downloads should be aware of the legal framework governing television music:

As demand grows, producers may begin officially releasing episodic BGMs as ringtones — a trend seen in other regional industries. Until then, the search for “ Nenjam Pesuthe serial BGM ringtones download upd” reflects a genuine audience connection to music. For now, the safest, clearest, and most respectful way to enjoy these tunes is through official streaming while using personal creation tools for ringtones.

You can find updated BGM and title song ringtones for the popular Polimer TV serial Nenjam Pesuthe

Check music streaming apps like Gaana, JioSaavn, or Wynk Music. They often have a wide collection of TV show and movie BGMs.