EC200U-EU Modem Not Connecting with Jetson Orin Nano on Kernel 5.15.136-tegra


I am using an EC200U-EU modem with my Jetson Orin Nano. Previously, I was able to get it working on Ubuntu 20.04 by following the attached document’s configuration steps. However, after upgrading the kernel and Ubuntu versions, I am unable to establish a PPP connection, although the SIM card and network are detected.

Here are the relevant details:

  • Kernel Version: 5.15.136-tegra
  • Modules Loaded: cdc_ether, option (rndis_host not loaded)

AT Commands:

  • AT → RDY OK
  • AT+CGDCONT=1,“IP”,“internet” → OK
  • AT+CFUN=1 → OK
  • AT+CGATT=1 → OK
  • ATD*99# → CONNECT

Despite the “CONNECT” message, no connection is established.

I have attached the ModemManager logs for reference. Additionally, I have not modified the serial and wwan files in the kernel.

Any assistance on how to adapt the configuration to the new kernel would be greatly appreciated.

I also want to be able to run it smoothly with the modem manager at the end of the day.

Thank you!

modem_manager_logs.txt (237.3 KB) (442.0 KB)

Quectel_UMTS_LTE_5G_Linux_USB_Driver_User_Guide_V3.1.pdf (483.3 KB)

There is no need to use PPP or ModemManager.
All you need to do is use AT+QICSGP to configure APN once, AT+QNETDEVCTL to [auto] “dial” and setup a regular DHCP interface on your host system.

I ran the commands you mentioned and it automatically connected to the internet as USB Ethernet.

Can please share the steps clearly , I still find difficulty of connecting


AT+CFUN=1,1 //Reset Modem

AT+CGATT=1 //Enable GPRS

AT+QNETDEVCTL=3,2 //Connect Auto USB-Ethernet

AT+QNETDEVCTL=0 //Remove Auto USB-Ethernet