So you got Error 27! In my case i had a SEVERE Error 27 failure. Long story short Bought the Phantom in USA flew it inside a huge indoor garage the day I got it. Did not read any manuals or do any thing to it. Just charger the battery and flew it right of the bat. Worked real nice! Got confident and cocky and started to mess around. Well the inevitable happened I bumped into a garage door but only at less the 10 inches of the ground. Two blades were damaged. Decided to order some more blades before my return trip hom to Rio De Janeiro. Got back to Rio. Put on the new blades. Called my buddy over and was going to show him the Phantom. The craft took off in such a nose dive! There went two more blades. ( Glad I bought a bunch ). Started to read up on the Phantom and connected it to my computer ( A mac running VmWare) There were error 27 26 and 25!! Holy crap! To get rid of error 26 a basick IMU calibration sorted that out. The error 25 was not easy on my heart but worked. Open the Phantom up put it on the side with NAZA text upp ward slam it with the back of a screwdriver ( well not to hard but it was rubber part of the screwdriver ) Error 25 GONE! Now the **** 27 Error! After about 60 emails forward and back with Robert from UAV Products ( formerly DJI USA ) I managed to get rid of error 27 and the craft flies nice now. So how did I get rid of Error 27! Took me 2 hours of magnet and just doing what they do in this video http://youtu.be/Vo7Kf3uo93I Some people say takes up to 10 times. Took me 2 hours!!! but worked. I did try different magnets and the less powerful magnets seem to do the trick better! THANK YOU ROBERT FOR YOU PATIENCE AND HELP! To Infinity and Beyond!!!