Last news: one more attempt successfully upgraded the device.
The LAN IP management is now working correctly.
But the status page show NO MOBILE connection, despite it is connected.
If I try to edit MOB1S1A1 settings, it fails after 30 seconds with gateway timeout.
I tried to remove the MOB1S1A1 interface and re-create it: the device is now not accessible anymore though HTTP (ping OK).
SSH also is not working despite enabled.
Also, I was unable to get a working WEB CLI (through WEBGUI or through RMS).
Also, the switch management page seems broken (I loose connectivity with the device if I remove pre-existing VLAN 2).
That's a really long list of non-working features.
I recommend you reach us with some level of transparency about this matter, because I have the gut feeling that you perfectly know that the product was not ready for market, and we are about to blacklist Teltonika. After all, Sierra Wireless or CraddlePoint are more expensive, but they work flawlessly.
Thank you