Question

RUT950 will not connect to modem.

Output of command "ls /dev" and "hexdump -c /dev/mtdblock1" below.

Is it hardware failure?

root@Teltonika-RUT950:/usr/sbin# ls /dev

autofs              mtd0ro              mtd6                mtdblock7           shm

bus                 mtd1                mtd6ro              net                 tty

console             mtd1ro              mtd7                network_latency     ttyATH0

cpu_dma_latency     mtd2                mtd7ro              network_throughput  ttyS0

full                mtd2ro              mtdblock0           null                ttyUSB0

fuse                mtd3                mtdblock1           port                urandom

kmsg                mtd3ro              mtdblock2           ppp                 watchdog

log                 mtd4                mtdblock3           ptmx                zero

mem                 mtd4ro              mtdblock4           pts

memory_bandwidth    mtd5                mtdblock5           random

mtd0                mtd5ro              mtdblock6           rs485

root@Teltonika-RUT950:/usr/sbin# hexdump -c /dev/mtdblock1

0000000  \0 036   B   7   h 277 377 377 377 377 377 377 377 377 377 377

0000010   R   U   T   9   5   0   0   0   2   X   X   X 377 377 377 377

0000020   0   1   2   3   4   5   6   7 377 377 377 377 377 377 377 377

0000030   1   1   1   4   5   7   2   6   0   5 377 377 377 377 377 377

0000040   0   1   2   1 377 377 377 377 377 377 377 377 377 377 377 377

0000050   2   0   1   7 377 377 377 377 377 377 377 377 377 377 377 377

0000060 377 377 377 377 377 377 377 377 377 377 377 377 377 377 377 377

0000070   4   9   2   4 377 377 377 377 377 377 377 377 377 377 377 377

0000080   7   0   8   6   5   4   8   8 377 377 377 377 377 377 377 377

0000090   s   2   R   5   Y   n   u   1 377 377 377 377 377 377 377 377

00000a0 377 377 377 377 377 377 377 377 377 377 377 377 377 377 377 377

*

0010000

Comments

System log:

"Wed May 24 12:30:24 2023 local1.info gsmd[5335]: gsmd started.

Wed May 24 12:30:24 2023 local1.crit gsmd[5335]: unable to open serial port '/dev/modem_cmd'."

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Hello!

I did as you asked and added the troubleshot file.

Best regards!
Joe

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Indeed, it seems like the device logs are filled with failure messages, and it is almost guaranteed to have experienced a hardware failure. If your device is still under warranty, please return it for RMA.

  

Best regards,
DaumantasG

Answer 1

Hello,

 

Indeed, this looks like a hardware failure, as the modem is not visible in the /dev directory.

It usually shows up as 4 USB devices - ttyUSB0, ttyUSB1, ttyUSB2, and ttyUSB3. Did the device stop detecting the modem randomly, or was something changed?

I'd also like you to post the output of the command lsusb to check whether the modem is in recovery mode or completely disconnected.

  

Best regards,
DaumantasG

Comments

Hello!

The strange thing is that the device worked perfectly and from one day to another, when I changed the SIM-card, it stoped working.

I did what you asked and thiss showed up: root@Teltonika-RUT950:~# lsusb

Bus 001 Device 001: ID 1d6b:0002

Bus 001 Device 024: ID 05c6:f601

root@Teltonika-RUT950:~#

Best regards

Joe

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Hmm, the modem does not seem to show up here either. Could you try placing the original SIM into the device (even if it's deactivated) and check if the modem recovers?

If it does, please navigate to System → Administration → Troubleshoot and generate a troubleshoot file. It can be attached to the original post.

  

Best regards,
DaumantasG

Answer 2

Ok. Seems strange cause it is not used for such a long time. I bought it a couple of years ago but did not use it until now.

Im not sure cause the recipt is not to be found. But I presume that you will fix it as it is a high grade quality router from yor well reckoned brand.

Best regards

Joe

Comments

I'm not sure because the recipe can't be found. But I'm sure you'll fix it because it's a high-quality router from a well-known brand.

geometry dash scratch

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Hello,

  

The issue could have been caused by improper storage of the device (high humidity, etc.), physical damage, or even broken solder joints between the modem and the PCB.

If you manage to find the receipt, please return it to your supplier, as they are responsible for the RMA procedure, and the device must go through them.

  

Best regards,
DaumantasG