Because Sony officially terminated software downloads for this model in January 2022, you must use reliable third-party archives. The latest firmware version is M5.167 .
You can download the Sony Bravia KDL-32S5600 TV Firmware M5.167 from Softpedia or TousLesDrivers . Download SONY KDL 32S5600 Software rar
The update takes approximately 10 minutes. The TV lights may blink, and it will automatically restart once finished. Do not turn off the power during this process. Download SONY KDL 32S5600 Software rar
Use a USB flash drive (minimum 2GB) formatted to FAT32 . Download SONY KDL 32S5600 Software rar