@cecco16 @vuleslash This firmware solved the issue, with Tele2/Telemach. It was provided by the live chat support and I had to run the whole upgrade operation remotely which was a bit of a concern,...

@vuleslash Hi there! I have had the same issue, with this router and a Tele2 SIM card in Croatia. If you try to connect your client with a VPN client - I tried with ExpressVPN - the it all works...