You can find the firmware for the (1920x1080 resolution) available for download on community-sharing platforms that host TV software archives. Download Sources

Insert it into the TV, then power the TV on (or hold the power button while plugging it in) to start the automatic update.

: This software has been archived on the lcd tv led tv smart tv software Telegram channel. Look for the file named Ecostar_MST6M182VG-T7S 471-01A2-61703G_1920x1080_Software.rar (approx. 2.4 MB) posted around June 2020.

Copy the extracted .bin file to the root directory (not in a folder).