Sorry for the issues you are having.

Can you please look in your Mac Bluetooth settings for any H90 devices and “forget” them? You also need to select “forget” from the H90’s Bluetooth menu. Then try the entire pairing process again using H90 Control: https://cdn.eventideaudio.com/manuals/h90/1.7.1/content/system-menu/bluetooth.html

If you are still having issues, go to About This Mac > System Report > Hardware > Bluetooth and locate the “chipset” information.

Please email support@eventide.com with the chipset information and we can determine if the updating your OS will resolve the connection issue.