cameras disconnected .. can't figure out how to get them back online.

my cameras show "DISONNECTED" and I don't know how to get them on again. The technicians said i would have to go through each one and set it up as new. Four are outside, up high.  I cannot do this. I would have to hire a handyman to climb up with a ladder. Isn't there a way to fix this without having to go through these steps?