768M (as indicated by your file name) File Format: Split RAR archive (Part 03) Download & Resource Locations
Technicians frequently share these files in specialized "LCD/LED TV Software" channels like Hashmi Telecom . Installation Warning 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. 768M (as indicated by your file name) File
Open the back of the TV to confirm the board model is exactly LDD.H510.B138 . you must download (Part 01
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.
A primary source for this specific firmware is KenotronTV , though it often requires registration or a paid subscription to download.