@yerebakan
I apologise for the late reply.
As far as I understand you, the problem is that the value of the interface description field cannot be set from the Android app. And also the value set via the web GUI is also disappearing from the device config if you change or overwrite the DSL connection configuration via the app?
If so, this appears to be a known issue on Android, which we are currently fixing.
If I've misunderstood you, please tell me.