| Metric | Old Firmware (Marshmallow) | New Firmware (Nougat) | Improvement | | :--- | :--- | :--- | :--- | | | 52 seconds | 31 seconds | +40% faster | | Netflix App Launch | 11 seconds | 6 seconds | +45% faster | | 4K YouTube Buffer Time | 4.2 seconds | 1.8 seconds | +57% faster | | HDMI Input Switching | 3.1 seconds | 1.4 seconds | +55% faster | | Total Free RAM after boot | 380 MB | 620 MB | +63% more |
For owners of the , a 43-inch 4K Ultra HD Android TV released in 2015, keeping the firmware current has always been a balancing act. While newer TVs get monthly patches, this mid-range marvel from Sony’s ‘X83’ series relies on staggered, critical firmware updates. Firmware Change Update on SONY KD-43X8309C
By Tech Long Reads | Updated: 2026
– Install it, perform a factory reset, and enjoy another 2-3 years of smooth 4K viewing. Have you installed this update on your KD-43X8309C? Report your experience in the comments below. For manual downloads, always visit Sony’s official support portal. | Metric | Old Firmware (Marshmallow) | New
If you own this TV and are seeing the “New firmware available” prompt, you need to read this guide. We break down exactly what changes, what breaks, and what gets better after this update. The latest Firmware Change Update on SONY KD-43X8309C 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). Have you installed this update on your KD-43X8309C