Official firmware is usually provided as a .pkg file directly from Hisense Support . However, for specific board "dumps" (RSAG7.820.1898), technicians often use community-driven databases:
service manual - hisense rsag7.820.4680 chassis sch - Elektrotanya Download Hisense TLM40V86PKV RSAG7 820 1898 Dump rar
If you have a functional firmware file (e.g., upgrade_loader.pkg ), follow these steps: Official firmware is usually provided as a