The four-year-old Samsung Gear S2 just got a surprise update

You can't accuse Samsung of neglecting older watches, as it's emerged the four-year-old Gear S2 smartwatch is in line for a new firmware update. It's been a couple of years since the model last received any attention, though, as spotted by Sammobile, the watch's latest software rollout will see battery life and security improvements. Upgrade:…