I bought a used H9 too, I sent the email to support@eventide.com, but no one answered my message, I need to register it in the account I created.

Yes, I see you sent an email on Monday afternoon about that.  Our normal support person is on vacation.  So, we're dealing with support issues a bit more slowly than usual.

We do ask people to take a photo of the serial number of their H9 if they'd like it unregistered.  So, please take a photo of your H9's serial number with your phone or whatnot, and send it to support@eventide.com letting us know that you'd like the unit unregistered.