Error 1F XX 2700/6F1B

Hello guys!

Anyone knows what the error means? Got it when launched my iPhone, for some reason it was about to set up something, but had odd layout (black background ang quite large, blue Cancel and Accept letters, seem unusual to me). After I accepted that set up, got the subjected error (1F XX 2700/6F1B). Now seem to work normally.

My device iPhone 6s IOS 10.2

Thanks:)