I have three C510W with same HW Version but only one has the new FW 1.2.1 The other two says FW is the newest but it is 1.1.2. What can i do to update these both to 1.2.1?

I have the C520WS, but I’m having trouble with it detecting a person walking on the distant street. From the camera to the street, it’s about 36 feet away, and even though it’s not completely dark, th