Teltonika RUTX50 R 00.07.15.1 - internal modem unreachable (shutdown unexpectedly) after upgrade

[wifiman]

hi folks,

i did the suggested update to 7.15.1, after the update the mobile modem does not work any more.

first i tried a simple warm reboot executed via gui. the modem shows the sim-card, connects short to the provider, but after that its suddenly not working any more.

second i tried a cold reboot via power off for 10 seconds and plug it back again. result is the same.

third i did a manual downgrade to 07.15 via downloading the file from teltonika and uploading it to the gui. result is the same.

how do i get the modem working full and reliable again?

thank you in advance and best regards

[anon65719490]

Hello,

Thank you for reaching out.

Could you please try or share the following information:

1. Flash the 7.15.1 firmware through the bootloader menu. Instructions for this process are available here.
2. After booting, do you see any modem-related errors in the WebUI, such as “internal modem is unreachable” or similar?
3. Please check the Status → System page, confirm whether the internal modem information is displayed at all. Also, under Device info section, verify if the Serial number, hardware revision, and batch numbers are visible and correct.
4. If the issue persists, kindly access the CLI and provide the output of the lsusb command.

If none of these steps resolve the problem, we may need to troubleshoot the situation privately.

Let me know how it goes.

Best regards,

[wifiman]

Hi,

thank you for your helpful answer!

1. starting the bootloader succeeded on first try. flashing the file RUTX_R_00.07.15.1_WEBUI.bin also worked on first shot.

2. after booting the errors seems to remain the same. it looks like there is some kind of mechanism to do at least a couple of automatic retries to get the mobile modem working.
   

   

3. no information about the internal modem is displayed:
   

   

serial number, hardware revision and batch number do match the printed sticker on the bottom. so i guess this is ment to be correct?

4. using the cli integrated into the gui didnt work on first and second try. using ssh worked on first try:

BusyBox v1.34.1 (2025-06-16 07:05:11 UTC) built-in shell (ash)

    ____        _    ___  ____
   |  _ \ _   _| |_ / _ \/ ___|
   | |_) | | | | __| | | \___ \
   |  _ <| |_| | |_| |_| |___) |
   |_| \_\\__,_|\__|\___/|____/
------------------------------------
     Teltonika RUTX series 2025
------------------------------------
   Device:     RUTX50
   Kernel:     6.6.87
   Firmware:   RUTX_R_00.07.15.1
   Build:      79942d47fec
   Build date: 2025-06-16 07:42:55
------------------------------------
root@RUTX50:~# 
root@RUTX50:~# lsusb
Bus 003 Device 001: ID 1d6b:0002
Bus 001 Device 001: ID 1d6b:0002
Bus 002 Device 001: ID 1d6b:0003
root@RUTX50:~#

Did I answer all your questions?

Do you need any more informations?

Thanks again,
wifiman

[anon65719490]

Hello,

Thank you for the update and answers. In this case, I believe, to assist you effectively, we’ll need to continue this process privately. You should find a support request form in the inbox of the email address you used for your forum registration. Kindly fill out the form, and please reference Ticket ID: 14379 when submitting it. Once the form is completed, we’ll contact you directly via email to investigate the issue in detail and help work towards a solution.

Best regards,

[wifiman]

Thank you.

submitted.

[wifiman]

Dear Teltonika-Team,

I enjoyed really good remote support from your tech support team. Your colleague tried everything on CLI to got the modem working again. Never the less the result from your support team is, that the RUTX50 needs to send in for RMA and my device has still warranty.

Unfortunately I moved to another city in my country and RMA over the seller is really complicated. I already explained this to your tech support.

He mentioned I could sent the device on my on cost to Teltonika for RMA Process. I did what he told me to do and sent a message using the contact form on your website on monday this week but til now I got no answer.

Thats why I ask you to support me with direct information how I can send my device for RMA process.

Thank you in advance,
wifiman

[anon65719490]

Hello,

Thank you for your feedback regarding our technical support.

As you already have an open HubSpot ticket created, I kindly ask you to continue the conversation through that private support channel.

Regarding the RMA process, we will send you more details on that shortly via that ticket.

Thank you for your patience and cooperation.

Best regards,