# \#usb-driver

**URL:** https://forum.lightburnsoftware.com/tag/usb-driver/325.md

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## [Setup issues with K40/cohesion3d to windows 11](https://forum.lightburnsoftware.com/t/setup-issues-with-k40-cohesion3d-to-windows-11/150143)

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**Author:** [@Amanda.B](https://forum.lightburnsoftware.com/u/Amanda.B)\
**Replies:** 0\
**Last updated:** [September 17, 2024, 9:36am UTC](https://forum.lightburnsoftware.com/t/setup-issues-with-k40-cohesion3d-to-windows-11/150143 "2024-09-17T09:36:37Z")

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Hi there, I have recently purchased a K40 laser with Cohesion3d. I have a windows 11 and have had issues connecting. The laser is not connecting to the computer via usb. It reads it on occasion but hasn’t maintained con…

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## [Recurring Error: "Port failed to open - already in use?"](https://forum.lightburnsoftware.com/t/recurring-error-port-failed-to-open-already-in-use/113705)

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**Author:** [@rencheple](https://forum.lightburnsoftware.com/u/rencheple)\
**Replies:** 2\
**Last updated:** [October 24, 2023, 9:09pm UTC](https://forum.lightburnsoftware.com/t/recurring-error-port-failed-to-open-already-in-use/113705 "2023-10-24T21:09:55Z")

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For the last two days, I have been having tremendous trouble getting my Elegoo Phecda to connect with Lightburn, with almost no problem before that. Nineteen out of twenty times I try to connect, I get a “Port failed to …

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## [Light burn will not connect to laser](https://forum.lightburnsoftware.com/t/light-burn-will-not-connect-to-laser/76556)

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**Author:** [@Spencerv](https://forum.lightburnsoftware.com/u/Spencerv)\
**Replies:** 9\
**Last updated:** [September 19, 2022, 7:07pm UTC](https://forum.lightburnsoftware.com/t/light-burn-will-not-connect-to-laser/76556 "2022-09-19T19:07:15Z")

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Labor will not connect to my laptop and shows everything looks fine but laser not connected

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## [Fiber Laser not found](https://forum.lightburnsoftware.com/t/fiber-laser-not-found/74315)

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**Author:** [@0Fh](https://forum.lightburnsoftware.com/u/0Fh)\
**Replies:** 1\
**Last updated:** [August 30, 2022, 6:46pm UTC](https://forum.lightburnsoftware.com/t/fiber-laser-not-found/74315 "2022-08-30T18:46:07Z")

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I take a new PC (Win 10 64) to test LB. No old driver was installed on this machine. I installed BJJCZ driver out of LB. I plug in Fiber Laser, my Computer recognize a new “USB-Device” but can´t handle the installed dr…