RUTX12 - Secondary Modem unreachable

AGAIN I have got an issue with a Teltonika router! RUTX12 is notifying „Secondary Modem unreachable“.

This is happening since the latest FW upgrades to version RUTX_R_00.07.05.3 and RUTX_R_00.07.05.4. SIM cards have been checked and are working fine. Rebooting the device does not help. CLI/SSH command lsusb:

Teltonika RUTX series 2023

Device: RUTX12
Kernel: 5.10.188
Firmware: RUTX_R_00.07.05.4
Build: d48a3687a6
Build date: 2023-11-07 14:54:54

root@XYZUSER:~# lsusb
Bus 003 Device 001: ID 1d6b:0002
Bus 001 Device 001: ID 1d6b:0002
Bus 001 Device 002: ID 05e3:0610
Bus 004 Device 001: ID 1d6b:0003
Bus 002 Device 001: ID 1d6b:0003
Bus 001 Device 003: ID 0a12:0001
Bus 001 Device 017: ID 2c7c:0306
Bus 003 Device 002: ID 2c7c:0306

It is absolutely annoying that ALL of my Teltonika devices (RUT850, RUT 955, RUTX11, RUTX12) have been affected by any hard- and/or software issues in the past. THIS IS ABSOLUTELY DISAPPOINTING !!!

No answers so far? Issue is still existing and the RUTX12 is useless.


We have received your email, and our sales managers will be in contact with you shortly.
Thank you for your patience.

Best regards,

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