The Panasonic TX-55HX900E LCD TV Firmware 3.326 is the latest firmware update for this model of TV. This firmware update provides enhancements and updates to the existing features of the TV. 

Features:

• 55 inch 4K Ultra HD resolution with support for High Dynamic Range (HDR).
• VESA Certified DisplayHDR 1000 for superior brightness, color, and contrast.
• Billion Colors for more accuracy and fluid display.
• Adaptive Backlight Dimming for better control in bright scenes.
• Dolby Vision IQ and Dolby Atmos for better audio output.
• Built-in streaming apps for popular streaming services, including Netflix, Amazon Prime Video, and YouTube.
• Voice control with Amazon Alexa or Google Assistant on compatible devices.

Specifications:

• Dimensions (W x H x D): 1232 x 782 x 300mm
• Weight: 23kg
• Display: 55-inch (diagonal) 4K Ultra HD, LED Backlit LCD display
• Resolution: 3840 x 2160 pixels
• Refresh Rate: 100 Hz BMR
• Brightness: 1000 nits
• Audio Output: 20W
• Connectivity: 4x HDMI, 2x USB, LAN, Earphone Jack, Optical Audio Output, Component Input, Composite Input, Wi-Fi, Bluetooth, DLNA, Mirroring (Display Mirroring), RCA Audio Jacks, Satellite In And LNB In, CI Slot

Known Issues:

Some users have reported issues with the TV firmware update including audio linking out and other audio-related issues. Blank audio noise and compatibility with selected HDMI inputs have been also reported, so it is important to make sure you are using the latest firmware version provided for your specific TV model. Additionally, if you experience any compatibility-related issues with any external devices, make sure those devices have the latest firmware updates too.

Troubleshooting:

If you are experiencing issues with the firmware update, it is best to get in touch with Panasonic's customer support team to assist you in properly troubleshooting these problems. The manufacturer also has extended guides and manuals on their official site.

Driver:

The Panasonic TX-55HX900E LCD TV Firmware 3.326 comes with its built-in driver after installing this firmware on one's TV therefore external drivers are not required.