Sam, I would love to see your squashfs dump. Unfortunately your link seems to have expired. Any chance you could upload that again? Also I might be able to provide some assistance on the Sercomm firmware update packages. First take a look at the firmware mod kit:
And these two decompiled Sercomm tutorials, both using the FMK:
I also have a few flash_dumper images for the iCamera1000 and iCamera2, as well as update packages from Comcast and Cox. I am currently working on tracking down packages for the RC8021 and RC8026. Let me know if you are interested.