# EM9191 not found in LattePanda3Delta m.2Bkey slot

**URL:** <https://forum.sierrawireless.com/t/em9191-not-found-in-lattepanda3delta-m-2bkey-slot/30565>\
**Category:** IoT Modules\
**Created:** [September 6, 2023, 4:34pm UTC](https://forum.sierrawireless.com/t/em9191-not-found-in-lattepanda3delta-m-2bkey-slot/30565 "2023-09-06T16:34:50Z")\
**Posts on this page:** 1\
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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:** [September 12, 2023, 1:30am UTC](https://forum.sierrawireless.com/t/em9191-not-found-in-lattepanda3delta-m-2bkey-slot/30565/7 "2023-09-12T01:30:39Z")

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pin 20 → high (1.8V)  
pin 22 → high (1.8V)

check pin 28 for power loss acknowledge  
pin 24, pin 68, pin 38 → VCC (3.3V)

You might need to contact distributor for a schematic review

Btw, other user can make it work in m.2 adaptor:

> [@EM9190: No response for AT!USBCOMP? command](https://forum.sierrawireless.com/t/em9190-no-response-for-at-usbcomp-command/30596/6):
>
> there should be two USB ports enumerated, /dev/ttyUSB0 and /dev/ttyUSB1. you might also see this topic:

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