@surfboomerang I don’t think firmware update or SuuntoPlus app update should reset SuuntoPlus app configuration, at least in Suunto Vertical or Suunto Race. If I remember correctly, SuuntoPlus app data is stored in eMMC that is not erased in firmware update. But Suunto 9 Peak Pro might be different as it doesn’t have eMMC, therefore SuuntoPlus app configuration is probably reset in firmware update.
Uninstalling SuuntoPlus app from watch will reset configuration, I think that’s by design.