It looks like you're searching for specific firmware files to repair or update a TV (using the MS6486T PB753 Go to product viewer dialog for this item. motherboard with a 1920x1080 resolution).
For the safest results, use official Hisense support channels. They often provide firmware based on your specific , which prevents bricking your TV with the wrong version.
Once you have both part1 and part2 of the .rar archive, do the following:
Select both parts and extract them to get the main software file (usually ending in .bin or .pkg ).