What does a red exclamation point inside a triangle mean?

[AC Question]

what does a red exclaimation point inside a triangle mean

I have a HTC one M7

 

[Golfdriver97]

Re: what does a red exclaimation point inside a triangle mean

Welcome to the forums. It sounds like you rebooted into recovery. You can longpress the power button to simulate a battery pull. That should get your back into Android proper.