To update your TV firmware via USB, follow these steps provided by Philips Support : Format an empty USB flash drive to FAT32 .
Never turn off your TV or remove the USB drive during the installation process, as this can damage the device. 50PUT6800/56 6800 series 4K UHD Slim LED TV ... - Philips
Follow the on-screen instructions. The TV will restart once the process is complete.
The firmware for the is typically provided by Philips as a single compressed ZIP file rather than multi-part RAR files. You can download the official software directly from the Philips Support Page for this model. Official Download Details Version: 000.007.070.000 Format: ZIP file Size: ~827.5 MB Official Source: Philips Support Installation Instructions
On your TV, navigate to Settings > Update Software > Current Software Info to ensure you aren't already on the latest version.
The update screen should appear automatically. If not, go to .
Download the ZIP file to your computer and extract the contents. The only file that should be on the root of your USB stick is the autorun.upg file. Flash Firmware: Turn on the TV. Insert the USB stick into the TV's USB port.