# WP8548 cannot connect with USB

**URL:** https://forum.legato.io/t/wp8548-cannot-connect-with-usb/5004
**Category:** Legato Application Framework
**Created:** [February 14, 2020, 2:48pm UTC](https://forum.legato.io/t/wp8548-cannot-connect-with-usb/5004 "2020-02-14T14:48:22Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![vin883](https://avatars.discourse-cdn.com/v4/letter/v/7ba0ec/32.png) [@vin883](https://forum.legato.io/u/vin883)
#### Post date: [February 14, 2020, 2:48pm UTC](https://forum.legato.io/t/wp8548-cannot-connect-with-usb/5004/1 "2020-02-14T14:48:23Z")

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Hi everyone,

My WP8548 is installed on a custom board, which has been designed to be close to the MangoHred.

Power line 3.7V is ok, as well as USB signals (Vbus, D+ and D-).  
I downloaded and installed the windows drivers (GenericDriverSetup.exe).

Sierra wireless ports do not appear in the windows Display manager and wp8548 isn’t detected either in the Developer studio discovered devices wizard.

Is there something missing in hardware/drivers to connect to my WP8548?

Regards,

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### Author: ![vin883](https://avatars.discourse-cdn.com/v4/letter/v/7ba0ec/32.png) [@vin883](https://forum.legato.io/u/vin883)
#### Post date: [February 17, 2020, 2:00pm UTC](https://forum.legato.io/t/wp8548-cannot-connect-with-usb/5004/2 "2020-02-17T14:00:41Z")

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Ok, problem solved, I forgot to activate the POWER\_ON control input (tie to GND) on pin 59!

Maybe it will help another developper.

Regards,