For anybody experiencing issues similar to this, you should first try updating your H90 to the latest firmware using Recovery Mode. It is not necessary to sequentially update through every firmware release, you should always update to the latest release.
Instructions for Recovery Mode can be found here: https://cdn.eventideaudio.com/manuals/h90/1.5.2/content/appendix/startup.html#recovery-mode
If that doesn’t work, please email support@eventide.com and let them know what you’ve tried.
