They called it the Quiet Update.
Since official support ended at Lollipop, developers on platforms like XDA Developers have created stable Marshmallow-based alternatives:
Given its August 2016 security patch level, BPH1 is vulnerable to: smg530h firmware 60 1 best
Chipset Variance: The SM-G530H has two versions: one with the Snapdragon 410 (MSM8916) and another with the Spreadtrom chipset. Most 6.0.1 ROMs are built for the Snapdragon variant; installing the wrong one will result in a "hard brick."
If you choose to install a custom ROM, the following options are popular for the SM-G530H: The Last Update — SMG530H Firmware 60
. There is no official Android 6.0.1 Marshmallow release from Samsung for this specific model.
Resurrection Remix 5.8.5: Highly recommended by many users for its stability and extensive customization options, though it is based on Android 7.1.2 rather than 6.0.1. Best for: Pure Android experience & daily driving
Since there is no "best" official firmware for 6.0.1, the community-recommended "best" versions are stable third-party builds: