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This software update (version v4.721) provides the following benefits: - Improves general performance of the TV - Improves the Home screen menu for better usability and operation - Adds Dolby MS12 AC4 support - Adds USB tethering support - Adds Browser Smooth Scroll and CH+/- operation for page ... read more.
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Sony KD-43X720E 4K TV Firmware 4.721 full details