Try power cycling while doing the recovery process of holding down the A and H knobs. If that doesn’t work, please reach out to support@neuraldsp.com and they will hopefully get you sorted quickly.
They wrote me from the support team and they have solved the problem: You have to start and when the loading bar appears press A and H at the same time and select Reset To Factory Default. I lost the presets, but it works perfectly.
I leave here the answer they gave me:
Can you please try the following:
Turn off the unit
Disconnect all the cables
Wait 30 seconds, connect only the PSU cable, and turn it on again
On the loading/splash screen, press and hold the “A” and “H” stomps