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Hi,

my RUT955 often looses mobile connection as the complete modem seems to fail. Logs show "modem disconnected" and "modem not found" errors as well as many others:

Wed Aug  3 09:33:04 2022 kern.info kernel: [ 4469.979666] option1 ttyUSB0: GSM modem (1-

port) converter now disconnected from ttyUSB0                                           

Wed Aug  3 09:33:04 2022 kern.info kernel: [ 4469.993605] option1 ttyUSB1: GSM modem (1-

port) converter now disconnected from ttyUSB1                                           

Wed Aug  3 09:33:04 2022 daemon.info gsmd[3187]: gsmd[write_to_serial():579]: Write to 1

-1.4 modem /dev/ttyUSB2 serial failed                                                   

Wed Aug  3 09:33:04 2022 daemon.info gsmd[3187]: gsmd[dispatch_work():1015]: Problem wit

h writing to serial - modem /dev/ttyUSB2                                                

Wed Aug  3 09:33:04 2022 kern.info kernel: [ 4470.062305] option1 ttyUSB2: GSM modem (1-

port) converter now disconnected from ttyUSB2                                           

Wed Aug  3 09:33:04 2022 kern.info kernel: [ 4470.076289] option1 ttyUSB3: GSM modem (1-

port) converter now disconnected from ttyUSB3                                           

Wed Aug  3 09:33:07 2022 daemon.info gsmd[3187]: gsmd[handle_modem_removed():1904]: Mode

m 1-1.4 with port /dev/ttyUSB2 removed                                                  

Wed Aug  3 09:33:07 2022 daemon.info gsmd[3187]: gsmd[handle_modem_removed():1906]: Stop

ping operctl if needed                                                                  

Wed Aug  3 09:33:07 2022 kern.info kernel: [ 4473.508349] option 1-1.4:1.0: GSM modem (1

-port) converter detected                                                               

Wed Aug  3 09:33:07 2022 kern.info kernel: [ 4473.515164] usb 1-1.4: GSM modem (1-port)

converter now attached to ttyUSB0                                                       

Wed Aug  3 09:33:07 2022 kern.info kernel: [ 4473.523503] option 1-1.4:1.1: GSM modem (1

-port) converter detected                                                               

Wed Aug  3 09:33:07 2022 kern.info kernel: [ 4473.530353] usb 1-1.4: GSM modem (1-port)

converter now attached to ttyUSB1                                                       

Wed Aug  3 09:33:07 2022 kern.info kernel: [ 4473.538700] option 1-1.4:1.2: GSM modem (1

-port) converter detected                                                               

Wed Aug  3 09:33:07 2022 kern.info kernel: [ 4473.545544] usb 1-1.4: GSM modem (1-port)

converter now attached to ttyUSB3                                                       

Wed Aug  3 09:33:07 2022 kern.info kernel: [ 4473.553903] option 1-1.4:1.3: GSM modem (1

-port) converter detected                                                               

Wed Aug  3 09:33:07 2022 kern.info kernel: [ 4473.560733] usb 1-1.4: GSM modem (1-port)

converter now attached to ttyUSB4                                                       

Wed Aug  3 09:33:09 2022 kern.info kernel: [ 4474.760650] option1 ttyUSB0: GSM modem (1-

port) converter now disconnected from ttyUSB0                                           

Wed Aug  3 09:33:09 2022 kern.info kernel: [ 4474.774699] option1 ttyUSB1: GSM modem (1-

port) converter now disconnected from ttyUSB1                                           

Wed Aug  3 09:33:09 2022 kern.info kernel: [ 4474.788632] option1 ttyUSB3: GSM modem (1-

port) converter now disconnected from ttyUSB3                                           

Wed Aug  3 09:33:09 2022 kern.info kernel: [ 4474.802553] option1 ttyUSB4: GSM modem (1-

port) converter now disconnected from ttyUSB4                                           

Wed Aug  3 09:33:09 2022 daemon.info gsmd[3187]: gsmd[init_new_modem():1679]: Unavailabl

e to open device port /dev/                                                             

Wed Aug  3 09:33:09 2022 daemon.info gsmd[3187]: gsmd[handle_modem_added():1872]: Someth

ing went wrong                                                                          

Wed Aug  3 09:33:11 2022 daemon.info gsmd[3187]: gsmd[handle_modem_removed():1899]: Mode

m 1-1.3 not found                                                                       

Wed Aug  3 09:33:17 2022 daemon.info gsmd[3187]: gsmd[handle_modem_removed():1899]: Mode

m 1-1.4 not found                                                                       

Wed Aug  3 09:33:18 2022 daemon.info gsmd[3187]: gsmd[handle_modem_removed():1899]: Mode

m 1-1 not found  

I attached a troubleshoot file.

Best

Manuel

1 Answer

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ago by

Hello,

From the log file, it shows that the modem is not seen by the device.

Try to reflash the FW using bootloader menu. Note, that with the bootloader you will only be able to upload legacy FW version and only then upgrade to RUTOS7.

If this does not help, it will mean the LTE modem is most likely faulty and you will have to send the device in for warranty