How to clone a modem and download certificate from an online modem?

[Bruiser]

I didn't think reading data erased it, but I did think that power cycling the modem would.
Which would be pretty much required to read the data from a former sub modem, if you have to solder a harness in it.

You are saying that I can unplug a former sub modem, solder a harness in it, connect a jtag and read the config from it? 
Unplugging it doesn't erase it?