Inside the extracted folder, you should see files like:
Nikai NT-40A11, Nikai NT-32D20, Nikai 43UHD-A6)Settings > Device Preferences > About > ModelIf your TV is not finding an update automatically, you may need to download the firmware file for your specific model. NIKAI SMART TV - Software Zone Nikai Android Tv Software Update Download
: Format a USB flash drive to FAT32 and copy the firmware file (often an file) directly to the root directory (not inside any folder). Connect to TV Nikai Android TV — Software Update Download Report