The firmware for 1366x768 resolution can be downloaded via community-driven repositories that host LED TV dump files. Download Sources
: Flashing firmware or "dumping" flash memory carries a risk of bricking your device. Ensure the T4C1 model and 1366x768 resolution match your board exactly before proceeding with a programmer or USB update. Download TSUMV56 MSD3553 T4C1 1366X768 Mirror Dump rar
Locate the or Mirroring option and toggle it between On/Off. The firmware for 1366x768 resolution can be downloaded
: A specific mirror dump for this board (often associated with EcoStar or Haier models) is available on the lcd tv led tv smart tv software Telegram channel . Look for the file named EcoStar$TSUMV56 MSD3553-T4C1=1366X768-Tuner.rar . Download TSUMV56 MSD3553 T4C1 1366X768 Mirror Dump rar