Looks like latest firmware for these devices is as follows:
Outlets
3210-L - 0x20085010
3210-L2 - 0x20115010
Iris Motion
3326-L - 0x1C005310
Iris Door/Window
3320-L - 0x1C005310
Iris Smart Fob (4 button)
3450-L - 15005301
Iris Water Leak
3315-L - 1c005310
Update 12-12-2018: I successfully have updated 3 x motion sensors, 4 x water sensors, and 1 x outlet thus far...
