This is the most challenging part. CVTE (now part of SigmaStar) does not host public firmware. Instead, you need to source it from:
: Many 512MB boards experienced "hanging" or loading loops in streaming apps. Updated firmware often includes patched APKs or system-level optimizations to reduce memory usage. Logo and Panel Matching cvte msd338 512m update 2021
Do you have the (found on the sticker behind the screen) to verify which firmware resolution you need? This is the most challenging part