For 95% of users, this is a critical positive update . The performance gains significantly extend the usable life of the 2015-era hardware.
: Many users on the Sony USA Support Forum note that while updates add features, the aging hardware struggles with newer OS versions. Menu navigation can feel sluggish, and apps may take longer to open. Firmware Change Update on SONY KD-43X8309C
The latest transitions the TV from the legacy Marshmallow (Android 6.0.1) base to a heavily optimized Nougat (Android 7.0) variant, specifically PKG6.8265-0104 (regional variants may show as v3.905 in Europe). For 95% of users, this is a critical positive update