I finally got it through my thick head that I will never be able to get firmware 3.06 back on my bird. So I want to try 1.08 out, but before I do I'm hoping someone can answer these questions I have: 1) Is it OK to use the software 1.08 to downgrade ONLY the main controller software and leave all the other components using their latest firmwares, or will that cause problems? I have everything at the latest except for the batteries, which are at 2.0. Also I have the latest versions of DJI VISION and FPV Booster apps on my phone. See screenshots: 2) Do I need to calibrate the IMU when changing firmware? 3) I actually just noticed the 1.08 assistant I have says "PHANTOM 2 VISION" and not "PHANTOM 2 VISION+" (see screenshots above). This OK? And then for actually flying on 1.08... Please confirm or correct the following - There are no distance or altitude restrictions when flying. - There are no battery warnings (?) or autolanding behavior (?) - The max speed (max tilt angle) is increased for all three modes (GPS, ATTI, FAILSAFE)? - Anything else important? Thanks again everyone for the help.