# USB not working **URL:** \ **Category:** Quad Cortex\ **Created:** [March 16, 2025, 5:38pm UTC](https://unity.neuraldsp.com/t/usb-not-working/17596 "2025-03-16T17:38:08Z")\ **Posts on this page:** 5\ **Page:** 2
**Author:** ![JJPT](https://avatars.discourse-cdn.com/v4/letter/j/a87d85/32.png) [@JJPT](https://unity.neuraldsp.com/u/JJPT)\ **Post date:** [November 1, 2025, 9:37am UTC](https://unity.neuraldsp.com/t/usb-not-working/17596/22 "2025-11-01T09:37:24Z")
> [@byteminer](#): > > nd various cables with no success: The USB port appears to have died and there’s no chance of repairing this yourself. Same here. USB port died suddently. I have a NO in the USB connection diagnostics but my computer dettects the QC propperly ANY UPDATE?? ---
**Author:** ![byteminer](https://sea2.discourse-cdn.com/flex020/user_avatar/unity.neuraldsp.com/byteminer/32/338_2.png) [@byteminer](https://unity.neuraldsp.com/u/byteminer)\ **Post date:** [November 1, 2025, 12:04pm UTC](https://unity.neuraldsp.com/t/usb-not-working/17596/23 "2025-11-01T12:04:50Z")
Since I was out of warranty and left out to dry anyway, I messed around with jailbreaking and gaining access to the system to see if there’s anything on the Linux side of the QC I could potentially do to work around this problem, but they seemingly improved their security in CorOS 3+ so it’s not that easy to gain SSH access anymore. Haven’t managed full access yet, I might mess around with it some more at some point. If your PC detects the QC still, you’re already a step further than some of us in this thread. ---
**Author:** ![and\_alencar](https://sea2.discourse-cdn.com/flex020/user_avatar/unity.neuraldsp.com/and_alencar/32/8034_2.png) [@and\_alencar](https://unity.neuraldsp.com/u/and_alencar)\ **Post date:** [November 1, 2025, 1:15pm UTC](https://unity.neuraldsp.com/t/usb-not-working/17596/24 "2025-11-01T13:15:58Z")
In my case, as my Quad Cortex was out of warranty, I sent it to a local unofficial technical support and I was informed that I needed to replace the equipment’s processor. This cost me about 30% of the Quad Cortex’s value. I fixed it and sold it. Today I’m with a Fender Tone Master and I’m very satisfied. It seems to me a more robust equipment and less prone to this type of problem. ---
**Author:** ![Alan](https://sea2.discourse-cdn.com/flex020/user_avatar/unity.neuraldsp.com/alan/32/8342_2.png) [@Alan](https://unity.neuraldsp.com/u/Alan)\ **Post date:** [November 12, 2025, 1:01am UTC](https://unity.neuraldsp.com/t/usb-not-working/17596/25 "2025-11-12T01:01:58Z")
Mine had the same issue — it was repaired in March, but it failed again today. In Germany they give a 3-year warranty, and mine expires in 4 days. I live in Latin America, and sending it back is expensive. Such a bad experience. ---
**Author:** ![artichokeplum](https://sea2.discourse-cdn.com/flex020/user_avatar/unity.neuraldsp.com/artichokeplum/32/11178_2.png) [@artichokeplum](https://unity.neuraldsp.com/u/artichokeplum)\ **Post date:** [October 5, 2026, 4:00am UTC](https://unity.neuraldsp.com/t/usb-not-working/17596/26 "2026-10-05T04:00:51Z")
Hey ! recently i got a similar issue, but with a QC mini I had already installed everything available and tried thousands of ways to get Cortex Control to work, but Windows still wouldn’t recognize the device. I tried installing the QC 5.58.0 drivers from August 2023, and when I connected the QC Mini, Cortex Control worked and Windows recognized the device. The problem was always related to the drivers. Try that ! [Previous page](https://unity.neuraldsp.com/t/usb-not-working/17596.md?page=1)