You can find the official ROMs on the Xiaomi Global Community forums or reliable third-party sites like XDA Developers. Look for the specific build number required for the Mi TV 4A Pro 32".
Tip: The file usually comes in a .zip format. Do not unzip it. mi tv 4a pro 32 inch software update download
Based on the final update for the Mi TV 4A Pro 32-inch (late 2021/early 2022), users typically see: Navigate to About: