My new Phantom 2z will be here next week, and I read that the first thing to do before flight, is to upgrade the firmware on all componants. Are any of the most recent firmware problematic, and should be avoided? I read some were unable to get their PH2's to lift off the ground after an update, and had a headache of a time figuring out what caused it. I also read that some thought the gimbal pitch speed was way too fast in the latest update... So, I would like your advice on which firmware updates to install, and which to avoid. I would like to have a great first experience with my PH2, and not be grounded due to firmware issues. Thank you!