Yes, this latest software version was released 10/03/2017 for your TV(XBR-55X810C).
The section below provides a list of benefits provided by previous updates and included in the latest System Software Update.
- Adds support for (Hybrid Log-Gamma) HDR content via HDMI input (does not apply to the XBR43X830C, XBR49X800C, XBR49X830C, XBR55X810C, XBR65X800C and XBR65X810C models)
- Reduces input lag for 4K HDR gaming (does not apply to the XBR43X830C, XBR49X800C, XBR49X830C, XBR55X810C, XBR65X800C and XBR65X810C models)
- Updates the system software to Android™ M (Marshmallow)
- Improves the general performance of the television
- Adds support for 4K Live/NeuLion® Sports digital video technology
- Improves general software quality of the TV
- Improves RVU support
- Adds Twin Picture (PAP function) support
- Resolves a condition where a black picture may occur after performing a remote Off/On (KDL-75W850C)
- Supports PlayMemories Online service
- Supports PlayStation™ Now service
- Improves Wi-Fi connectivity of the TV
- Improves picture quality (dynamic range, noise reduction, sharpness)
- Supports Netflix® streaming service (4K Models)
- Improves Lip Sync for HDMI input
- Improves performance and stability of the USB video playback features
- Resolves a condition where a black screen and no sound may occur when an input changes from YouTube® to another input
- Resolves a condition where a black screen may occur during USB video playback
- Supports Internet-based EPG (Electronic program guide)
- Supports Netflix streaming service (2K Models)
- Supports Amazon®, Pandora®, and Crackle™ applications
- Supports Force Reboot by holding down the Power key on the BT or IR remote controller
- Improves performance and stability of overall UI operation
- Improves performance and stability of the Action Menu
You can also check these items from this link.
https://esupport.sony.com/p/support-info.pl?info_id=1681.
If you need to update your television, you can check the guidelines from this link.
https://us.en.kb.sony.com/app/answers/detail/a_id/40952.