thanks for the whole , I mean complete explanation 
, you know I used cmnonexp2mb to extract the certs but only got this, why is it ?
c:\>cmnonexp2mb -f extracted_nonvol.bin
cmnonexp (CableModem non-volatile explorer for BCM3348/BCM3349)
Version: 1.1.1 (Apr 20 2009 17:57:34)
©2008-2009 under GPLv3 by qingpu & raikol
Read 32768 bytes from file extracted_nonvol.bin
I also tried cmnonexpv1.1.1
By the way what I'm not sure is if the Firmware from a SB5101 will work here, cause remember mines an SBG 901 and has a different broadcomm cpu BCM3361 , so what do you think are memory addresses the same?
, you know I used cmnonexp2mb to extract the certs but only got this, why is it ? c:\>cmnonexp2mb -f extracted_nonvol.bin
cmnonexp (CableModem non-volatile explorer for BCM3348/BCM3349)
Version: 1.1.1 (Apr 20 2009 17:57:34)
©2008-2009 under GPLv3 by qingpu & raikol
Read 32768 bytes from file extracted_nonvol.bin
I also tried cmnonexpv1.1.1
By the way what I'm not sure is if the Firmware from a SB5101 will work here, cause remember mines an SBG 901 and has a different broadcomm cpu BCM3361 , so what do you think are memory addresses the same?