DS-2TD2637-35/QY. DS-2TD4228T-10/W. For better user experience, we highly recommend you to update your device to the latest firmware. You can search for the firmware by the product model name on the page. Firmware - Download - Hikvision. For better user experience, we highly recommend you to update your device to the latest firmware. You can search for the firmware by the product model name on the page. D7jzU.