Do you believe the error message would go away with a solid GPS lock? When I first starting getting the error message, I was indoors. I never took it outside to see if the remote no longer showed that error message once connected to 7+ satellites. I have NO INTENTION of flying it indoors so maybe it's not important if it still works outside? I just don't like the error message on my remote controller I guess. Should I try upgrading again to .600?
I am worried that DJI made a lot of improvements from .400 to .600 and there might be other problems that were successfully addressed with the new firmware but I'm not using it.