The reference refers to the main PCB (Printed Circuit Board) used in the Hisense H50M3300
: Using incorrect firmware can permanently damage (brick) your TV's main board. If you are not experienced with TV repair, it is advised to consult a local engineer or reach out to Hisense customer support for guidance. Televisions: Common Questions - Hisense-USA Download File RSAG7.820.6392_Hisense H50M3300.p...
To ensure you get the correct and safe firmware version for your TV, it is strongly recommended to use official channels: The reference refers to the main PCB (Printed