Please download the latest FW from our official webiste:
https://www.hikvision.com/en/products/IP-Products/Network-Video-Recorders/Pro-Series/ds-7616nxi-i2-s/?q=ds-7616nxi-i2-s&pageNum=1&position=1&hiksearch=true&subName=DS-7616NXI-I2%2FS%28E%29