Hello, I am experiencing a persistent internal modem problem on a RUTM30 which started immediately after a modem firmware update. Before the modem update the router was working normally. I got sometimes notification that the intern modem is unreachable (unexpected shutdown) The issue persists aft…

I think they’re released a buggy modem firmware.

Any possibility to downgrade the modem firmware?

Hello, i’ve found a workaround for the people with the modem firmware problem: Choose 4G instead 5G! In the device go to: Network→Mobile→Connection Choose the correct SIM-Card (the one you use for the internet) Edit the “Prefered network typ” to 4G/3G auto Save & Apply See the attached Screen…

Greetings, Apologies for the delayed response. Could you please try navigating to Network → Mobile → Connection And select NSA for the 5G Mode [image] Please let me know if this resolves the issue. Best Regards, Justinas

I’ve tested it- IT didnt Work. In the notification: “internal Modem is unreachable” So right now the only workaround seems Like Switch to 4G. The Rest is Up to you to get a new Modem Firmware running;-)

Just adding that I have had exactly the same fault - works on 4G but if I set it to 5G/5G/3G auto and 5G mode to NSA, it says ‘modem unreachable’. [Screenshot 2026-04-05 at 19.39.17]

Same issue here! After updating the modem’s firmware, 5G connections can no longer be established or drop immediately. 4G connections are still possible. Release RG520NEBDCR03A05M4G appears to have a bug. Please investigate this and provide a fixed version or a way to downgrade to a stable version. …

[image] RUTX50 internal modem unstable after RG520 modem firmware update – SIM failure, gsmctl N/A, no registration Issue Hello everyone, and thanks a lot for the tips on fixing the problem. Sorry, but all these workarounds are, in short, bullshit. I spe…

RUTM30 modem problem after FW update

Networking Solutions Issue

Leigh April 6, 2026, 1:50am 10

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