This was really a nice challenge. After a crash the phantom wouldn't fly anymore. Connected to the software I got this error 25. The DJI help service only stated that you had to contact the dealer and it would probably necessary to replace the (expensive) NAZA module. After a little research on the internet I found suggestions to remove the naza module from the phantom and give it a little bangs (G-forces) and replace it. Wow, it worked. After recalibration the error was gone and the phantom was OK.