Less than a couple of months after rolling it out to the Snapdragon variant in the country, Samsung has started pushing out the Marshmallow update to the Exynos variant of the Galaxy S5 (SM-G900H) in India. Bringing along Android 6.0.1, the update is rolling out over the air (OTA), as well as available through the South Korean company's Smart Switch software for PCs. You can also manually check for it by heading to the Settings menu on your device. Via
Source: http://www.gsmarena.com/marshmallow_starts_hitting_galaxy_s5_exynos_variant_in_india-news-18641.php