Ensure your TV specifically uses the board and the V400HJ6-PE1 panel to avoid damaging the device.
Based on your request, the firmware for the (TP.MT5510S.PB802, V400HJ6-PE1, 1920x1080) can be found in technical service databases. Key Resources to Download the Firmware: Download MT5510S PB802 1920x1080 40PL11TC POLARLINE zip
Offers a dedicated dump for this exact model and mainboard. Remont-aud.net : Provides another version of the dump. Ensure your TV specifically uses the board and