I'm having second thoughts about doing this upgrade. Hope you can get yours going.
I did get this working that night. It crashed once, and I had to restart the process. The PHantom wifi was gone, even with a few restarts.
Then I deleted the DJI GO app, and re-uploaded that.
Then I "forgot" the phantom network in the phone, and re-searched for it and entered the default wifi password.
I may be able to fly it this weekend.
After the last update, it had this really weird oscillation, then corkscrewing. I recalibrated the compass so it went away the first time I tried to fly it. The second time after that, the oscillation was back.so we will see what this one does.
I read advice a long time ago that said "if your quad flies well, don't update the firmware no matter what" In this case, to do that, you have to make sure your outside cell, or wifi network that leads to the internet is off before opening the DJI GO app, and connected to your quad.
Otherwise, it won't let you fly unless you update first.
Good luck!