Ewon 131 need removed from previous account

I have an ewon cosy 131 that is still attached to the previous system integrator but has since gone out of business and have no way of contacting them. I need to activate this unit to my account, I have the activation key as well as the serial number. Please help

Hello,

Submit your request to mysupport.hms.se

When you submit your request ensure that you have a proof of purchase, or documentation of ownership of the eWON unit.