Firmware_V5.5.84_210104 Applied to: DS-2CD1321-I(2.8mm)(E) Firmware_V5.7.23_241008 Applied to: DS-2CD1321-I(2.8mm)(F) DS-2CD1321-I(4mm)(F) Accessories DS-1271ZJ-110 Pendant Mount Compare DS-1272ZJ-110 Wall mount Compare