I just wanted to put this out for anyone who upgrades via the Joyetech site. This is for the Cuboid, not Mini and not Evic. Upon using the latest upgrade which was released Sep. 8, my device would not turn on, this happened after my husband upgraded his firmware as well as we have two Cuboids. If this happens, simply upgrade the firmware again, going through the same steps. It needs to be done twice or your Cuboid will say version 0.0. This is probably just a slight glitch in the software, but if this happens to anyone else, follow the steps above to resolve.