# 5G Modem not working

Source: https://forum.modalai.com/topic/4317/5g-modem-not-working
Category: ESCs, Sensors and Accessories (https://forum.modalai.com/category/15/escs-sensors-and-accessories)
Tags: cellular
Posted: 2025-04-04 20:17:35 UTC by LR
Replies: 5 · Views: 1495

## LR · 2025-04-04 20:17:35 UTC

Hello,

I am using a Starling V2 Max with voxl-suite 1.4.2 and a Qualcomm 5G module (pictured below). I have inserted a Mint Mobile SIM card and followed the configuration steps from ModalAI's documentation.

During setup, I selected:
1️⃣ V2 as the modem (option 1)
2️⃣ No Modallink (option 2)
3️⃣ T-Mobile APN: fast.t-mobile.com (since Mint uses T-Mobile's network) (option 4)

However, the system fails to detect /dev/ttyUSB2, and running:

ls /dev | grep ttyUSB

returns nothing—indicating that no /dev/ttyUSB devices are available.

Any insights or troubleshooting suggestions would be appreciated.

Attached is a picture of the 5G modem for reference.
![Screenshot from 2025-04-04 15-14-59.png](https://forum.modalai.com/assets/uploads/files/1743797710575-screenshot-from-2025-04-04-15-14-59.png) 

Thank you in advance

## Reply by tom (ModalAI staff) · 2025-04-04 20:26:11 UTC

@LR What do you see with `lsusb -t` and `ifconfig`

## Reply by LR · 2025-04-04 22:28:50 UTC (in reply to tom)

@tom Here is the output for lsbusb -t![Screenshot from 2025-04-04 17-24-34.png](https://forum.modalai.com/assets/uploads/files/1743805506740-screenshot-from-2025-04-04-17-24-34.png) 

And here the one for ifconfig
![Screenshot from 2025-04-04 17-24-06.png](https://forum.modalai.com/assets/uploads/files/1743805522084-screenshot-from-2025-04-04-17-24-06.png) 

it says that the voxl-modem service is up and running but it is not connected to the internet

## Reply by tom (ModalAI staff) · 2025-04-04 22:46:44 UTC (in reply to LR)

@LR When running through `voxl-configure-modem` you'll want to select `em9191` not `v2`

## Reply by LR · 2025-04-05 02:33:49 UTC (in reply to tom)

@tom Thanks it worked! Out of curiosity, was it written somewhere and I missed that?

## Reply by tom (ModalAI staff) · 2025-04-07 16:51:25 UTC (in reply to LR)

@LR The 5G configuration on Starling 2 is a fairly new offering so there may not be fully representative docs live.