Are you sure you provided the correct file?
I believe the "upgrade" went through this time because the software version changed - to SBG6580-3.5.8.2-GA-00-488-NOSH.
Anyway it promptly reverted back to SBG6580-6.5.2.0-GA-06-077-NOSH as soon as I connected the coax again so no harm done.
Now we know this can be done and the process works at least.
The question is, if I manage to successfully upgrade the firmware, will it simply revert back to the version on the Comcast network when I reconnect?
I believe the "upgrade" went through this time because the software version changed - to SBG6580-3.5.8.2-GA-00-488-NOSH.
Anyway it promptly reverted back to SBG6580-6.5.2.0-GA-06-077-NOSH as soon as I connected the coax again so no harm done.
Now we know this can be done and the process works at least.
The question is, if I manage to successfully upgrade the firmware, will it simply revert back to the version on the Comcast network when I reconnect?