I can't get my socket to even try and update firmware, the button in the UI isn't active. 

I have 4 from the same box, one has been active, 3 have been in storage so are on very old firmware. The active one is on fire 1.5.5, the others are on 1.2.10.

I've tried resetting all three and other devices on the network upgraded successfully.

Any ideas? I can't even use them in smart actions at the moment.