# 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:** 1\
**Showing post:** 2

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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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