Sorry for the issues you are having.

Is this a new issue you are having since updating the H90 software? Or have you never been able to connect with Bluetooth?

Did you turn Bluetooth on in the H90 system settings? Does the left blue LED on the H90 turn on and remain lit?

Have you tried the steps to forget on both devices? These instructions are found under pairing tips: https://cdn.eventideaudio.com/manuals/h90/1.7.5/content/system-menu/bluetooth.html#ipad-connection