# EM9191 lost USB ports

**URL:** <https://forum.sierrawireless.com/t/em9191-lost-usb-ports/28777>\
**Category:** IoT Modules\
**Created:** [January 16, 2023, 10:09pm UTC](https://forum.sierrawireless.com/t/em9191-lost-usb-ports/28777 "2023-01-16T22:09:45Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![richey216](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/richey216/32/7426_2.png) [@richey216](https://forum.sierrawireless.com/u/richey216)\
**Post date:** [January 16, 2023, 10:09pm UTC](https://forum.sierrawireless.com/t/em9191-lost-usb-ports/28777/1 "2023-01-16T22:09:45Z")

</div>

Hello,

I have an EM9191 that I have may have disabled the USB interface on. Linux (lsusb), openWRT (dmesg), and Windows (device manager) no longer recognizes it. Is there a recovery method that I can use to regain access to the modem? I am interfacing it via an appropriate USB adapter that was working fine before making changes.  
I am not 100% certain what was done to cause it, I only know it was working and now it is no longer recognized.  
It has the latest generic PRI and related fw image flashed onto it.

---

<div class="post-metadata">

**Author:** ![jerdung](https://avatars.discourse-cdn.com/v4/letter/j/82dd89/32.png) [@jerdung](https://forum.sierrawireless.com/u/jerdung)\
**Post date:** [January 17, 2023, 8:07am UTC](https://forum.sierrawireless.com/t/em9191-lost-usb-ports/28777/2 "2023-01-17T08:07:58Z")

</div>

Hi @richey216,

Technically, I can help to troubleshoot about the configuration, AT commandand and something else in case the host receives the device’s port. In this case, I think it’s better to do RMA progress.

Please check your device’s warranty in the following link: [Sierra Wireless Inc. - Return Merchandise Authorization (RMA)](https://csm.sierrawireless.com/WarrantyChecker.aspx)

Thanks,