Hi,
I updated some RUT955 to Firmware 6.7.5 and recognized the following bug:
If "Custom APN" had an entry in the past, then this entry is active (or re-activated). It overrides any selection from the Auto-APN dropdown menu.
This is hard to see, because the custom-APN field is not shown unless you select "Custom" from the list. Took some time to figure that out.
You can only see it for a moment while the page is loading. I have a screenrecording video to show this. Just write me an email so I can send it if you are interested.
Workaround:
1) Do not use "Auto APN" checkbox (this never worked well until now)
2) Select "Custom" from the dropdown list and
3) manually type the APN in.
We are using data sim cards from Deutsche Telekom.
Normal APN is internet.telekom with private IP adresses
an old APN internet.t-d1.de still provides public IPv4 adresses.