Searching for the specific file name suggests you are looking for a multi-part firmware archive for a KIVI 49UP50GU
Do you have the of your KIVI TV to verify if this is the correct version for your specific hardware? Software - KIVI Download RT2861V09 3840x2160 16G Kivi 49UP50GU part08 rar
If you successfully download the complete set of files (all parts must be present to extract), the typical update procedure via USB is: Searching for the specific file name suggests you
All parts (part01, part02, etc.) must be in the same folder. Extracting part01 will usually combine them into a single file (often named MstarUpgrade.bin or similar). Download RT2861V09 3840x2160 16G Kivi 49UP50GU part08 rar