Another thread I started a few days ago talked about a recently purchased used P2 that doesn't have the correct startup lights and won't communicate with the Assistant software. The P2 in general is new to me so after spending some really late nights researching the issue and thoroughly checking out its internals, I found something interesting. Here's a pic of the flight controller from the Phantom 2 in question: Here's a pic of the flight controller in another P2 I also acquired recently that works correctly: From reading other threads it was apparent that the NAZA V2 flight controller shouldn't be in the P2. Several have stated that it causes problems. I'd say those are true statements. Using the NAZA Assisant software allowed the controller to communicate. One of the first things that came up was a compass error. No readings at all. The next thing I noticed was that the gimbal support is 2-axis only. But the drone arrived with an H3-3D Zenmuse installed. It seems that someone had good intentions but didn't really know what they were doing. My intention is to have this drone work as intended so I ordered a new main board with the "Phantom II" controller already installed. The board probably wasn't necessary but there was a nasty solder job on an ESC connection so for another $30 it's just good peace of mind. The controller and board is from a new dismantled P2 and cost $100. I'll keep the NAZA V2 for another project. Or maybe it will show up on eBay one of these days.