How to find out which firmware version I have?
For most cameras, you can find out the current firmware version using their web interface. For example, information about the firmware version of Hikvision camera can be found in "Basic Configuration - System - Information" section ("Firmware Version" paragraph).
To access the web interface of the camera, you must access it using the IP-address of the network, where the camera is located.
For more detailed information about where to find the firmware version, you can contact the manufacturer of your device.