If your NVR is running a very old version (e.g., V3.x), it is highly recommended to update in
On the Hikvision download page, search using the full model number, e.g.: ds7616nik2 firmware link
Searching for a ds7616nik2 firmware link often leads to shady forums promising "unlocked channels" or "removed license warnings." Risks include: If your NVR is running a very old version (e