When I got my KK2.0 Flight Control Board from HobbyKing, it had version 1.2 of the firmware on it. While this version works, and has auto-level capabilities, the newer version 1.5 firmware has a MUCH more stable auto-level function, as well as support for camera gimbal controls, which is something I definitely want to try out. Upgrading the firmware is very easy and only takes a couple of minutes. To do so all you need is a USBasp AVR Programmer and the LazyZero flash tool which is a free download available here. Once you have everything you need, you can follow the instructions in this video to get it done:
