: Plug the prepared flash drive into the USB 1 port on the TV. Trigger Update : Press and hold the Power button on the TV (not the remote).
: Place all downloaded .rar parts into the same folder on your computer. Extract : Download MT5522S PC822 3840x2160 Telefunken part04 rar
: Ensure you have downloaded all parts of the archive. The extraction will fail if any part, such as part04.rar , is missing. : Plug the prepared flash drive into the
Follow these steps to update the board via USB: Power Down : Unplug the TV from the wall outlet. Extract : : Ensure you have downloaded all
: Move the extracted firmware file (e.g., allupgrade_5522_8G_1G_ref56.pkg ) directly to the root of the USB drive. Do not put it inside any folders.
: The standby LED should begin flashing (often red/green or fast red), indicating the update is in progress.
: Verify the filename matches what is expected for your board; some versions require renaming the file to allupgrade_5522_sos.pkg to trigger a recovery. 3. Installation Procedure