If you are comfortable sharing, what is the device showing (e.g., stuck on logo, no power, looping)? This can help determine if a firmware flash is the right solution.
Search for the motherboard model on BadCaps or Bios-Mods .
Since the file is in .rar format, you will need a tool like 7-Zip or WinRAR to extract the .bin or .rom file inside.
Finding a "dump" file (a full copy of the firmware) for a specific motherboard like the TITANIUM T3100 (HMS050S-V1.0)
Check that your motherboard version is exactly HMS050S-V1.0
You will likely need a hardware programmer and a SOIC8 clip to flash this file.
If you are looking for this specific .rar file, check these specialized platforms:
Always use your programmer (like a CH341A) to read and save a copy of your original corrupted firmware before writing the new one. Technical Support & Verification