# Using M.2 5G Modem Addon Board (M0090) on voxl2 , can not found the /dev/ttyHS2 device

Source: https://forum.modalai.com/topic/1668/using-m-2-5g-modem-addon-board-m0090-on-voxl2-can-not-found-the-dev-ttyhs2-device
Category: General Questions (https://forum.modalai.com/category/2/general-questions)
Posted: 2023-01-06 08:15:57 UTC by Cheng Sheng Weng
Replies: 2 · Views: 486

## Cheng Sheng Weng · 2023-01-06 08:15:57 UTC

Hi, 
I am following https://docs.modalai.com/voxl2-external-flight-controller/
to connect external flight-controller.

Using M.2 5G Modem Addon Board (M0090)
The VOXL2 (M0054) can have the M.2 5G Modem Board Addon attached, which exposes a UART on M0090 - J9 that is accessible in VOXL2’s application processor as /dev/ttyHS2.

I can not found /dev/ttyHS2 device. How can I enable this device ? 

Please assist.

## Reply by modaltb (ModalAI staff) · 2023-01-06 15:08:56 UTC

Hi @Cheng-Sheng-Weng ,

Can you run `voxl-version` and paste info here?  That device should be available as of system image 1.3+

If you are on a 1.2.x image, please upgrade to the `VOXL2 Platform 0.9`
from https://developer.modalai.com/ and install following https://docs.modalai.com/platform-releases/#install

## Reply by Cheng Sheng Weng · 2023-01-07 06:30:51 UTC (in reply to modaltb)

@modaltb Thanks a lot . I have updated to system image 1.3+. The device can be find on /dev 

Best Wishes