# QC frozen after 2.0 update
**URL:** https://unity.neuraldsp.com/t/qc-frozen-after-2-0-update/9603
**Category:** Quad Cortex
**Created:** [January 25, 2023, 2:02am UTC](https://unity.neuraldsp.com/t/qc-frozen-after-2-0-update/9603 "2023-01-25T02:02:48Z")
**Posts on this page:** 10
**Page:** 1
### Author:  [@DeanG](https://unity.neuraldsp.com/u/DeanG)
#### Post date: [January 25, 2023, 2:02am UTC](https://unity.neuraldsp.com/t/qc-frozen-after-2-0-update/9603/1 "2023-01-25T02:02:48Z")
Hi all. Hoping this is something simple. Just updated to 2.0, all seemed ok. Did the reboot and at the end the QC reboots but then completely freezes when the first preset comes up. Nothing works, no sound, not buttons, touch screen or on / off button. The only way I can power it off is to pull the power. Is there a way to roll back to previous version?
Thanks,
Dean
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### Author:  [@DeanG](https://unity.neuraldsp.com/u/DeanG)
#### Post date: [January 25, 2023, 2:21am UTC](https://unity.neuraldsp.com/t/qc-frozen-after-2-0-update/9603/2 "2023-01-25T02:21:53Z")
I tried to get into the recovery screen by holding down A and H buttons, but that did not work.
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### Author:  [@DeanG](https://unity.neuraldsp.com/u/DeanG)
#### Post date: [January 25, 2023, 2:28am UTC](https://unity.neuraldsp.com/t/qc-frozen-after-2-0-update/9603/3 "2023-01-25T02:28:23Z")
OK, I unplugged my MIDI and footswitch cables, rebooted. This time it came up with a pop up box saying “finalizing 2.0 update” and now it no longer freezes! So if anyone has similar issues just unplug all of your cables and try it again.
Thanks,
Dean
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### Author:  [@Gig4Fun](https://unity.neuraldsp.com/u/Gig4Fun)
#### Post date: [January 25, 2023, 2:30am UTC](https://unity.neuraldsp.com/t/qc-frozen-after-2-0-update/9603/4 "2023-01-25T02:30:25Z")
Must be in the check sum portion. You will no doubt be helping someone who may use the search function here. Kudo’s mate.
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### Author:  [@HonestOpinion](https://unity.neuraldsp.com/u/HonestOpinion)
#### Post date: [January 25, 2023, 6:53am UTC](https://unity.neuraldsp.com/t/qc-frozen-after-2-0-update/9603/5 "2023-01-25T06:53:44Z")
> [@DeanG](#):
>
> OK, I unplugged my MIDI and footswitch cables, rebooted.
This is a good reminder that a best practice is to disconnect each and every cable prior to an update, including USB (unless of course there is a USB update option in the future). As of CorOS 2.0, there isn’t.
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### Author:  [@jallawalla](https://unity.neuraldsp.com/u/jallawalla)
#### Post date: [January 25, 2023, 10:26am UTC](https://unity.neuraldsp.com/t/qc-frozen-after-2-0-update/9603/6 "2023-01-25T10:26:23Z")
I have exactly the same problem. Just about to unplug my cables!
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### Author:  [@jallawalla](https://unity.neuraldsp.com/u/jallawalla)
#### Post date: [January 25, 2023, 10:33am UTC](https://unity.neuraldsp.com/t/qc-frozen-after-2-0-update/9603/7 "2023-01-25T10:33:41Z")
It worked!
Thank you so much!
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### Author:  [@DeanG](https://unity.neuraldsp.com/u/DeanG)
#### Post date: [January 25, 2023, 11:21pm UTC](https://unity.neuraldsp.com/t/qc-frozen-after-2-0-update/9603/8 "2023-01-25T23:21:10Z")
Not so simple when you have everything cabled up nicely on a pedal board or racked. Also not a problem I have ever had with any other device of mine that gets updated regularly, so was not something that occurred to me straight away.
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### Author:  [@HonestOpinion](https://unity.neuraldsp.com/u/HonestOpinion)
#### Post date: [January 26, 2023, 5:04am UTC](https://unity.neuraldsp.com/t/qc-frozen-after-2-0-update/9603/9 "2023-01-26T05:04:55Z")
Agreed, PITA, but I have seen peripheral devices and connections cause problems with other device’s updates as well. Anything from a shorted cable to a peripheral device that manages to hang some part of the update process that is being run on one of the input/output ports on the device being updated. Shouldn’t happen but on occasion it does.
Anyway, good on ya for figuring out what caused it. Hopefully the info regarding MIDI or footswitch connections interfering with the update will save someone else some aggravation during an update. Or perhaps Neural may change whatever might have caused this in the next update.
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### Author:  [@MP\_Mod](https://unity.neuraldsp.com/u/MP_Mod)
#### Post date: [April 15, 2024, 6:06pm UTC](https://unity.neuraldsp.com/t/qc-frozen-after-2-0-update/9603/10 "2024-04-15T18:06:50Z")