This is almost certainly Android firmware (an .img or .pak file) for a low-end car head unit or a portable projector stick.
The string you've provided appears to be a filename, specifically for a part of a larger file that has been split into multiple parts for easier transfer or storage. Let's break down the components of this filename to understand what it might represent: TP.SK513S.PB802 1920x1080-1G-8G-ONVO-USB.part3.rar
Plug the TV back in. On many Onvo/TP.SK513S boards, the upgrade starts automatically, indicated by a blinking standby light or an on-screen progress bar. This is almost certainly Android firmware (an
Updating the firmware is a delicate process often used to fix "boot loop" issues or "brick" states where the TV fails to start. the upgrade starts automatically