IF the DJI process failed and you have tried again but it wont do it, try this, we worked through this with people on RCG when the last fw was released and it worked in almost all cases
There seems to be a few people having problems upgrading to the latest firmware, Me and several other have been working through it and seem to have come up with a process that work's.
If you have not tried to update your firmware please follow DJI procedure first, that works fine in almost all cases.
If then that fails try the below.
Please try the following as we have worked through this all ready with a few people that could not update and had success. Please don't skip as step
1: Turn off the P3 and remove the battery for 20 minutes. makes sure its charged over 50% at this point.
2: Format the SD card again. Use the one it was supplied with
3:.Download the correct file again from DJI website,
4:.Place the correct .bin file from the new downloaded file on the SD card,
5:Turn on your controller.
6: Connect tablet and open the DJI Pilot app to camera.
7: Insert battery and turn on P3 with out SD card in and see if it connects to controller
8: if it connects then shut the P3 off, if it don't connect leave a few minutes then turn P3 off, don't worry if it does not connect to the app.
9: Close the DJI App but leave the controller turned on,
10: Insert SD card into P3 and turn on and allow software update.
11: Check update text file after its changed to finished tones.
12: Then please post the hidden log file located under the MISC\LOG\ folder on the SD card, you will need to enable I view hidden files and folders on your computer to see it
Here is the post I was taking about