A primary source for this specific firmware is KenotronTV , though it often requires registration or a paid subscription to download.
Firmware updates are hardware-specific. Flashing the wrong version (e.g., matching the board but not the panel resolution) can or result in an upside-down/distorted image. Download LDD H510 B138 3840x2160 768M Magic55 part03 rar
Because this is a multi-part archive, you must download (Part 01, Part 02, etc.) into the same folder before extracting them. A primary source for this specific firmware is
Open the back of the TV to confirm the board model is exactly LDD.H510.B138 . you must download (Part 01
Technicians frequently share these files in specialized "LCD/LED TV Software" channels like Hashmi Telecom . Installation Warning
768M (as indicated by your file name) File Format: Split RAR archive (Part 03) Download & Resource Locations