Hello,
Thank your for contacting Teltonika Networks support forum.
We are currently working on issues related to mobile internet connection and solutions will be provided in the upcoming 7.2 FW version which is scheduled to release quite soon.
When downgrading from a major release, let's say 7.1 to 7.0 keep setting option is not available as newer version have configuration files that would not be compatible with older releases
Regards,
Paulius