g., T.MS6486) for this model to help narrow down the search for the correct software?

To successfully extract the firmware, you must download all parts (part1, part2, part3, etc.) into the same folder before opening the first one with a program like WinRAR or 7-Zip.

Based on common community resources for IRIS SAT firmware, you can look for the complete set at these sites:

: A well-known repository for LED TV dump files and firmware. You may need a free account to access specific download links.

: Often hosts multi-part RAR files for IRIS and other Chinese-manufactured TV boards. Search for "49E700A" in their firmware section.