i'm trying to unpack a clear spot firmware update

this firmware

http://www.clear.com/support/download/spots/clear-spot-voyager

i used a fwtools to unpack the whole firmware from this page

http://hackspot.net/iSpotBlog/?p=177

after that i have " kernel.bin " and " rootfs.bin "

ok i want to add a new certificate to the modem and new Networks and some edits to the control panel 192.168.1.1 " it's Wimax Modem

when i check the rootfs file with this code

file rootfs.bin

i see this

rootfs.bin: Linux Compressed ROM File System data, little endian size 4280320 version #2 sorted_dirs CRC 0xbf224100, edition 16777728, 268441607 blocks, 1325400384 files

and this is the binwalk report

  DECIMAL         HEX             DESCRIPTION
-------------------------------------------------------------------------------------------------------
0               0x0             CramFS filesystem, little endian size 4280320 version #2 sorted_dirs CRC 0xbf224100, edition 16777728, 268441607 blocks, 1325400384 files
8               0x8             Squashfs filesystem, big endian, version 2.1, size: 4276396 bytes, 1028 inodes, blocksize: 65536 bytes, created: Fri Jun 22 23:02:36 2012

and this is the binwalk report for the whole .bin firmware update file

    root@bt:/pentest/reverse-engineering/binwalk# ./binwalk -m /pentest/reverse-engineering/binwalk/magic.binwalk /root/fwtools_20100826c/bin.linux/imw.bin

DECIMAL         HEX             DESCRIPTION
-------------------------------------------------------------------------------------------------------
855032          0xD0BF8         CramFS filesystem, little endian size 4280320 version #2 sorted_dirs CRC 0xbf224100, edition 16777728, 268441607 blocks, 1325400384 files
855040          0xD0C00         Squashfs filesystem, big endian, version 2.1, size: 4276396 bytes, 1028 inodes, blocksize: 65536 bytes, created: Fri Jun 22 23:02:36 20

i stopped here , i don't know how to unpack it , i just tried everything manually , firmware mod fit , fwtools , everything !

any help ?