Re-installing the native Android OS may not be possible and is not recommended, as you will not get all of the Android functionality back. Translates as: "you won't be able to sell an Android Xperia X in future". Who actually cares? (note also the "sale is final, no refund if you regret purchase").
Re-installing the native Android OS may not be possible and is not recommended, as you will not get all of the Android functionality back.