P4Pro +, getting error messages, "Magnetic Field Interference Fly with cauction

[strikeforce]

I launched my new Phantom 4 Pro + yesterday. I kept getting a message as I was going through the steps to calibrate my Quad before my first flight. I kept getting a message, "Magnetic Field Interference Fly with caution.
I think it could just be a firmware update, but I am unable to upload the latest firmware. I also got a message 2,2,2,2,2,2, error.
I was actually able to fly my bird, but was very hesitate to let it go out more than 2,000 feet. Please advise.

 

[Stanley]

It means that you switched on the P4 near a big iron thing. Move about 20m away to the place free of iron pieces.

 

[strikeforce]

Stanley, first, thank you for responding. I had considered that at first, so I drove down to a friend's family farm that has 1,800 acres of open farm ground. So I have ruled that possibility out.
I do get a message saying firmware up and another error message.
I have can still launch and fly my P4Pro + without any noticeable problems, but I cannot and will not foolishly fly it more than 2,000 feet. The RTH works well as well flying in A, S or P modes. I have to add that the built in monitor is a major disappointment. I can barely see what's on the screen and there doesn't seem to be an option of increasing the brightness.
My friends don't have Wifi, so I will drive over to the community library and see if I can get the firmware update in hopes that may remedy my problems.
I am pleased to post that my P3Pro after updating the latest firmware, which has caused other folks major problems, is flying without any problems so far.