Fitbit Flex unit wanted to have a software Update....couldn't get past this in set-up. So, elect an Update and item is screwed. Over an hour "chatting" to Fitbit on line help. I carry out all they advised and no difference. They give up. Later get e mail basically advising that my unit is outside of warranty and can't help but here's an e mail address to buy another from! From day 1 this item is a heap of rubbish. This problem of updates and freezing is the normal across all Fitbit products. I believe that after a couple of years they put out a software update that screws your Fitbit...I may be wrong but advising me to buy another rather than fixing mine STINKS. DONT BUY.