1.To avoid the unfold of virus from the firmware, which could bring about harm to the ANTMINER S19 series, the setting purpose of “Protected Boot” is switched on as well as “Root Authority” functionality has been disabled. A 180-day warranty period of time is delivered ranging from the delivery date. https://felixohask.vidublog.com/33588246/bitmain-antminer-s19-xp-an-overview