# EM9291 not recognized by OS

**URL:** <https://forum.sierrawireless.com/t/em9291-not-recognized-by-os/35729>\
**Category:** MC/EM Series\
**Created:** [January 21, 2026, 10:55pm UTC](https://forum.sierrawireless.com/t/em9291-not-recognized-by-os/35729 "2026-01-21T22:55:13Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![RevenstarTelecom](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/revenstartelecom/32/6327_2.png) [@RevenstarTelecom](https://forum.sierrawireless.com/u/RevenstarTelecom)\
**Post date:** [January 21, 2026, 10:55pm UTC](https://forum.sierrawireless.com/t/em9291-not-recognized-by-os/35729/1 "2026-01-21T22:55:13Z")

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Having a problem getting the EM9291 seen by Windows - it doesn’t show up in the device manager at all, under “_Network Adapters_” or even in “_Other Devices_”. It’s like it’s just not plugged in at all. No luck with OpenWRT either.

I read some very old threads on here that said very early 91xx devices might not work with a USB adaptor, but nothing about the 9291 at all. This one was purchased from Digikey just last week. The same USB 3.0-M.2 adaptor works fine with the EM7565 I tried it with.

I also tried it in a Windows tablet with a mini PCIe slot with an M.2-mini PCIe adaptor - same result.

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**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\
**Post date:** [January 22, 2026, 12:24am UTC](https://forum.sierrawireless.com/t/em9291-not-recognized-by-os/35729/2 "2026-01-22T00:24:34Z")

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you can see here:

> [@Problems Getting EM9191 Working with M.2 to USB Adapters](https://forum.sierrawireless.com/t/problems-getting-em9191-working-with-m-2-to-usb-adapters/31434/2):
>
> See if this helps:

For your m.2 adaptor: you need to check these pins for connecting with USB:  
pin 20 → high (1.8V), pin 22 → high (1.8V)

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<div class="post-metadata">

**Author:** ![RevenstarTelecom](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/revenstartelecom/32/6327_2.png) [@RevenstarTelecom](https://forum.sierrawireless.com/u/RevenstarTelecom)\
**Post date:** [January 22, 2026, 4:39am UTC](https://forum.sierrawireless.com/t/em9291-not-recognized-by-os/35729/3 "2026-01-22T04:39:22Z")

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I’ll have to get my scope probe out tonight since I don’t have any voltmeter leads small enough to measure these pins. I’m curious if it’s a USB issue, why it didn’t work when plugged into the mini PCIe slot of the tablet - unless the tablet only has the USB pins connected to its PCIe slots.