I purchased a used H9-Max from seller on Reverb, created account on Eventide website, tried to register the unit but got error message that unit is registered to another user. I contacted the seller; he told me that the unit was deregistered by the previous owner. I then sent a message to the support group, with photos of the serial number from unit and utility page but have not heard back after several days. Not sure if I am doing something wrong, maybe someone could point be in the right direction. Thanks