[Q] Upgrading bluetooth on a Samsung device

I have a Samsung Galaxy Grand Duos SM-G7102. Over the holidays I purchased a watch that supports Smart Notifications as-in it Bluetooth pairs with a supported phone and receives call and message notifications. But the "supported phone" caveat is that it must be a phone that supports BT 4.1. My phone supports BT 4.0. Is the difference just a software difference or some sort of radio difference? Is there a way to just update the Bluetooth on a phone?

There appear to be no roms available for this phone (DUOS is a dual-sim phone). Ideally you'd be able to suck the existing rom off the phone, update the bluetooth, and re-flash it.

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