It's important to clarify that the string you provided — TP.SK513S.PB802 1920x1080-1G-8G-ONVO-USB.part3.rar — is not a product name, a brand, or a standard commercial keyword.
.part*.rar files.means it is one of several required pieces. To use this firmware, you must have all parts (part1, part2, etc.) in the same folder to extract the final
Wait for the progress bar to reach 100%. The TV will usually restart on its own. Once the "First Time Setup" appears, remove the USB drive. Important Notice