This iFirmware is for the following models:
XBR-75X940C
XBR-65X930C
XBR-75X910C
XBR-65X900C
XBR-55X900C
XBR-75X850C
XBR-65X850C
XBR-55X850C
XBR-49X830C
XBR-43X830C
XBR-65X810C
XBR-55X810C
XBR-65X800C
XBR-49X800C
XBR-75X940D
XBR-65X930D
XBR-55X930D
XBR-85X850D
XBR-75X850D
XBR-65X850D
 
Download and Install Firmware using a USB flash drive
If your TV doesn't have Internet access and/or you wish to do the update manually, you can do so using a USB flash drive, by downloading the update from the Sony support website.
NOTES:
The USB flash drive must meet the following conditions:
The drive must be formatted in FAT16, FAT32, exFAT, or NTFS
The drive will need to have sufficient free space to accommodate the update file
The update file must be saved in the root directory of the drive
The update can fail even when using a USB flash drive that meets the above conditions, depending on the size and directory structure of other files on the drive. If the update does fail, delete other files and try again with only the update file saved in the USB flash drive. If the update still fails, format the USB flash drive to FAT32 and try again.