I’ve searched this and come up empty. When I open the H90 control app, at the bottom left hand corner it says Software Update available, but I cannot find anywhere in the app for doing the update. The website, says if there is an update available it will prompt me and ask me if I want to update, but that has not happened.
Click on the Home tab and on the bottom right of the square that corresponds to your pedal you should see a cloud icon. Click on it and the app will show you the available updates.