If your Caska unit runs Android (e.g., 9.0, 10, or newer), updates are often provided via OTA (Over-The-Air) or via a USB drive.
Given that official, publicly listed download hubs are scarce, a great deal of knowledge and resources about CASKA updates is shared within online communities. These forums are often the most practical place to find specific files and troubleshooting advice, though proceeding with caution is essential (more on that later). caska software update link