. If an update is available, the TV will prompt you to download it.
October 26, 2023 To: Technical Support / End User From: Technical Assistance Model: Sony KD-43X309C (Android TV 4K Ultra HD) Firmware Change Update on SONY KD-43X8309C
This was the first major “quality of life” update. . If an update is available
The most recent stable build for the KD-43X8309C (as of 2025) is typically or later. Key changes include: Firmware Change Update on SONY KD-43X8309C
Sometimes a firmware update introduces new problems. Here is how to fix them.
This is the easiest method if your TV is connected to a network. Sony Bravia KD-43X8309C HDTV Firmware 3.885