Download Rt2861v09 3840x2160 16g Kivi 49up50gu Part08 Rar -

Format a USB drive to FAT32 and copy the extracted file to the root directory.

If you successfully download the complete set of files (all parts must be present to extract), the typical update procedure via USB is: Download RT2861V09 3840x2160 16G Kivi 49UP50GU part08 rar

Searching for the specific file name suggests you are looking for a multi-part firmware archive for a KIVI 49UP50GU Format a USB drive to FAT32 and copy