Extracting Certs of a dump or modem?

[Jriskail]

Hi Guys, is it possible to extract the actual certs of a modem or flash forceware on it and extract the certs via forceware? I try unpack a full backup of the dump, but inside the certs folder I found mtacertReplaceMe, mtakeyReplaceMe, etc, but they are empty. I also try flashing my sub with forceware get the nvram and load it into the other modem, but this didn't work either. I am testing with a Moto 6220 and an Arris TM822