Samsung didn’t forget the Dual-SIM variant of its latest flagship, the Korean Giant released the official Android 5.1.1 Lollipop Update to the Galaxy S6 DUOS (SM-G9200).
The Update is Available Over-the-air (OTA) only, didn’t reach KIEs servers yet. The update package size is around 620MB in size and available in Dubai, the United Arab Emirates. However, it’s sure to spread to other markets soon.

Just as the changelog in the screenshot notes, aside from new Android build 5.1.1 Lollipop, the new software also brings with it some unnamed security enhancements, improved UI and system stability, and performance improvements.