We have a good news for Lenovo K3 Note users in India. The company has just started rolling out Android Marshmallow update for Lenovo K3 Note users in India.
It was already teased by the Product Manager for smartphones for Lenovo India. In the teaser, he gave us a glimpse of Android Marshmallow Easter. the latest update weighs about 1657MB in size. So need a good WiFi connection to download it. The build number after update is K50a40_S121_150813_ROW_TO_K50a40_S322_160314_ROW .
The update brings Android Marshmallow as the base OS to Lenovo K3 Note. Yo can check here for features included in Android Marshmallow.