Some board versions allow SPI dump via USB TTL. If not, at least note the current firmware date in the factory menu (usually accessed via "Menu + 1234" or "Source + 2580").
What are you seeing (e.g., stuck on logo, app crashes)? What is the resolution of your TV panel? cvte msd338 512m update 2021
Based on CVTE’s internal release notes (leaked via OEM service portals), the update included: Some board versions allow SPI dump via USB TTL
The was CVTE’s (or community-reverse-engineered) answer to these problems. stuck on logo
variant was released around August 4, 2021. These updates are usually distributed as files and are designed to address common issues: Bootlooping: Fixing the "Android is starting" or "Smart TV" logo hang. App Compatibility: