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I charged the batteries right before flying, they both showed 100% when I took off. I only flew once with one battery for about 12 minutes and then landed but didn't shut down. While I was talking to my neighbor I got a warning that I was down to 30% power. I think everthing is good with...

I haven't flown my P3 Advanced for about a year and today I got it out and it said I needed to do a firmware update. DO I have to do it if I am not having any problems?