Once again 6120 MAC Certs and Flash.

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ISP can only see What I'm using by name? they have no access to Modem ? I upload certs, change mac serial wait till ISP try to push firmware use that name and that's all ?
is there any software easier way to grab certs from 5100 or I can do it only unsoldering flash taking fulldump and extracting from there with sbtools or use jtag.