Make sure that the smart screen system is the latest version. Methods: Select Settings > System > Software Update to automatically scan the system version. If it is not the latest version, upgrade the system according to the prompts.
The old version of the system does not support the installation of software, and must be upgraded first. Connect the USB flash drive to the computer, then open the browser, find the software installation package and download it.
Connect the USB flash drive to the USB interface of the TV, and open the USB flash drive from the upper right corner.
Find the installation package on the USB flash drive.