Sorry to hear you are having issues. Can you please review this video to confirm you are performing the save function properly? https://youtu.be/4rAejz4_bjE?si=uAX-XGRD5vohg6UC&t=2122
You can also use the H90 Control app to view what is happening when you save your preset, or just use the app for managing your presets as it has a nice interface to do this.
