Go to Settings → Network → Advanced → Turn off “IPv6”. The Marshmallow firmware has a known IPv6 bug.
For more information on updating your SONY KD-43X8309C firmware, please refer to the following resources: Firmware Change Update on SONY KD-43X8309C
Required if the TV cannot connect to Wi-Fi or if the update fails over the network. Go to Settings → Network → Advanced →
The most recent major firmware versions (such as and v5.381 ) brought several transformative changes to this model: Firmware Change Update on SONY KD-43X8309C