I received my Shark Jack today. I charged the Shark Jack till the light turned solid blue. Then connected it to my laptop, Upgraded firmware successfully. Now if I disconnect it (fully charged) and go to any more (ARM or Attack). It will NOT boot up. If I connect the charging cable in any of these modes, it will immediately boot up in the desired mode. But I have to connect it to boot up. After boot up, if I disconnect it, its fine and will continue operating for a minute or two and then the light goes off.