It is almost certainly a mishandled engineering build or a maliciously packaged file targeting users searching for obsolete Android updates.
If you are still using a device with this firmware, you can attempt an official check, though it is unlikely to find anything: MK-918 (RK3188) Issues - Armbian forum
Updating Your Skyworth RTD298X TV: Firmware and Solutions If you are using a Skyworth RTD298X_TV001 device, you likely see build information such as 4.4.2 KOT49H in your system settings. This version corresponds to Android 4.4.2 KitKat
It’s extremely likely that this software program is clean.
We have scanned the file and URLs associated with this software program in more than 50 of the world's leading antivirus services; no possible threat has been detected. rtd298xtv001eng 442 kot49h update extra quality