If OTA fails or you need a specific firmware version (beta or region-specific), perform a via USB.
Updating the firmware on your is a straightforward process that can be done directly through the system settings. How to Update Firmware via Settings firmware update on xiaomi mi tv 4a pro 43 portable
Some developers create debloated or optimized firmwares (e.g., removing PatchWall, adding Viper4Android audio). Use these at your own risk. They are not officially supported. If OTA fails or you need a specific