5. Now you have a stock (non Zen) Fritz Box running v7.56. Crucially, the function to "Receive updates from internet provider" which was force ticked on in the Zen firmware no longer appears.
Good overall post except item 5 - relating to the
Internet > Account Information > Provider Services tab
I have Zen firmware and the function that is ticked and greyed out is
not for firmware updates but for receiving
automatic configuration information such as Internet account settings and VoIP settings. In general you should leave this on if you want services and service changes you order from Zen to work without manual intervention.
There is a separate tickbox directly beneath this which controls whether the ISP can direct the router to update its firmware automatically which you
can untick.
The above is entirely separate from the
System > Update > Auto Update settings.
This was covered earlier in the thread but not everyone reads in flat mode before posting.
prlzx on Zen: FTTC (VDSL) at ~40Mbps / 10Mbps
with IP4/6 (no v6? - not true Internet)