Look for the (which likely contains "A-media Auto -1024x600 S-"). Look for the MCU Version (e.g., MTCE, MTCH, or STM32).
Find a standard USB drive and format it to FAT32 on your computer. A-media Auto -1024x600 S- Software Update
The manufacturer does not host a universal public repository. Because these are OEM units sold under dozens of brand names (Eonon, Xtrons, Dasaita, etc.), you must source the update carefully. Look for the (which likely contains "A-media Auto