# Question about AT!USBCOMP

**URL:** <https://forum.legato.io/t/question-about-at-usbcomp/4715>\
**Category:** Legato Linux distribution (Yocto project)\
**Created:** [September 17, 2019, 2:16am UTC](https://forum.legato.io/t/question-about-at-usbcomp/4715 "2019-09-17T02:16:10Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![taojiafu](https://avatars.discourse-cdn.com/v4/letter/t/a9a28c/32.png) [@taojiafu](https://forum.legato.io/u/taojiafu)\
**Post date:** [September 17, 2019, 2:16am UTC](https://forum.legato.io/t/question-about-at-usbcomp/4715/1 "2019-09-17T02:16:10Z")

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![1](https://us1.discourse-cdn.com/flex019/uploads/legato1/original/1X/d2e2121002ec909a86748640604276d926e07fb0.png)

 ![2](https://us1.discourse-cdn.com/flex019/uploads/legato1/original/1X/d55db799a9bfe097d9913eeb8b19cc48ce9496da.png)

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**Author:** ![taojiafu](https://avatars.discourse-cdn.com/v4/letter/t/a9a28c/32.png) [@taojiafu](https://forum.legato.io/u/taojiafu)\
**Post date:** [September 17, 2019, 2:18am UTC](https://forum.legato.io/t/question-about-at-usbcomp/4715/2 "2019-09-17T02:18:16Z")

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xxxxxxx8：The last one must be 8. 8 Representative MODEM

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**Author:** ![taojiafu](https://avatars.discourse-cdn.com/v4/letter/t/a9a28c/32.png) [@taojiafu](https://forum.legato.io/u/taojiafu)\
**Post date:** [September 17, 2019, 2:20am UTC](https://forum.legato.io/t/question-about-at-usbcomp/4715/3 "2019-09-17T02:20:31Z")

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I want to set to single mode，00080000 (ECM).  
Don’t know if there are other ways? Still have settings that I don’t know, thank you for your answer.

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**Author:** ![plu](https://avatars.discourse-cdn.com/v4/letter/p/e19b73/32.png) [@plu](https://forum.legato.io/u/plu)\
**Post date:** [September 26, 2019, 12:46pm UTC](https://forum.legato.io/t/question-about-at-usbcomp/4715/4 "2019-09-26T12:46:50Z")

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hi @taojiafu,  
modem interface is the only interface that can’t be removed . it should be kept available, so that is normal that ERROR message is returned while running your command.

regarding such specific demand, please I suggest you use the following forum [https://forum.sierrawireless.com](https://forum.sierrawireless.com) which is dedicated to product itself, as the current one is for Legato topic;  
Best regards

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**Author:** ![taojiafu](https://avatars.discourse-cdn.com/v4/letter/t/a9a28c/32.png) [@taojiafu](https://forum.legato.io/u/taojiafu)\
**Post date:** [October 22, 2019, 12:45pm UTC](https://forum.legato.io/t/question-about-at-usbcomp/4715/5 "2019-10-22T12:45:45Z")

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Sorry, I have not logged in to the forum recently. Thank you for your answer