DJI Phantom Drone Forum

I can only do 420 characters per comment so I will send a couple messages to get this all to you.

Hi Jonathan, here is the link to my dropbox file, it is for the p4p+ version so I don't know if it will work properly on your p4p but I am pretty sure others have used it to do so and when you look on the DJI website it seems the software is for all p4p and p4p+.

Don't forget, when I was done the Go4 app would not start, it kept crashing, but this is the built in screen. Once I did a factory default on the RC and set it up again all worked properly. I cannot guarantee you success but I will help if I can. Let me know how it goes please.
Regards,
Randy (HTP)

https://db.tt/jndCoD3VxG

And please reply so I know you got my message.

Hi Randy, thank you for your effort! The problem is that I still got the RC firmware from the thread ( I have the + too . My problem is that I need the phantom's firmware 509 to patch this by hand. At the moment my battery will be offline in the app randomly, flying is fine but I can't have the battery status all the time.

Do you still have your p4p on 509 or 602 atm? Then you could upload me a backup from DUMLdore-master. Thank you!
Regards, Jonathan

The file I need is called "dji_system.bin" you can generate with this tool: https://github.com/jezzab/DUMLdore
You just click backup when the p4p is connected to the pc and it saves the firmware into this file.

Inside that file is the .509 rev for the aircraft I believe, when I copied it to the sd card root directory and put it in the sd card slot on RC and did a local update, it put the RC back to the right rev and then prompted me to connect RC to AC with the otg cable and it did downgrade the AC to the .509 rev build for me.

This is all I have, I always keep the downloads archived from dji when they get released, but this file is the only thing I have, so unless you have some way to reverse compile the binary, I'm not sure what to tell you.

My stuff is on the latest greatest and I have no issues, the reason I had downgraded was because I lost my maps and all audio from the RC (homepoint/warning, etc) and that did fix my issues. But like 10 days later the DJI file on the website had a new time/date stamp so I tried that version and all was well.