Unlike major brands, FNIRSI usually distributes firmware via direct Google Drive links, WeTransfer, or Telegram channels found in their YouTube video descriptions.
Navigate to the or About page on your device's menu. Note the version number listed (e.g., V1.x). fnirsi dsotc2 firmware
Once the file transfer is finished, the device screen will display "Update completed" at the bottom. Unlike major brands, FNIRSI usually distributes firmware via