Fixes for unexpected reboots, menu lag, or network connectivity issues are frequently included in release notes . How to Find the Correct Firmware
If your XVR5116HS is functioning correctly and all cameras are working, . Only update if you require a specific fix or support for a new camera. If you must update, rely on the manufacturer's support team to provide the exact file match for your Serial Number to avoid damaging the unit. xvr5116hs firmware