# Post-update issue

**URL:** <https://unity.neuraldsp.com/t/post-update-issue/21171>\
**Category:** Bug Reports\
**Tags:** support\
**Created:** [February 8, 2026, 8:07pm UTC](https://unity.neuraldsp.com/t/post-update-issue/21171 "2026-02-08T20:07:52Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![davidvodrazka](https://avatars.discourse-cdn.com/v4/letter/d/48db29/32.png) [@davidvodrazka](https://unity.neuraldsp.com/u/davidvodrazka)\
**Post date:** [February 8, 2026, 8:07pm UTC](https://unity.neuraldsp.com/t/post-update-issue/21171/1 "2026-02-08T20:07:52Z")

</div>

**CorOS Version:** 4.0.0

**Describe your issue:**

Quad Cortex got stuck after a firmware update.  
Update downloaded successfully, but unit became unresponsive.  
All footswitch LEDs blinking blue, no audio output, power button unresponsive.  
Recovery mode (A + H) does not work.  
Tried full power disconnect and multiple recovery attempts.

Only touchscreen is responsive.

---

<div class="post-metadata">

**Author:** ![MP\_Mod](https://avatars.discourse-cdn.com/v4/letter/m/ccd318/32.png) [@MP\_Mod](https://unity.neuraldsp.com/u/MP_Mod)\
**Post date:** [February 8, 2026, 8:09pm UTC](https://unity.neuraldsp.com/t/post-update-issue/21171/2 "2026-02-08T20:09:47Z")

</div>

I would definitely recommend that you email [support@neuraldsp.com](mailto:support@neuraldsp.com) so that they can log your issue and provide RMA or resolution. Also, make sure you are using the OEM power supply and with nothing plugged in when trying to reset.