Question: what does the lightning bolt mean on raspberry pi 3?
Answer: Re: Lightning bolt symbol Tue Apr 03, 2018 7:30 pm. Note that when using an RPI 3B+ a lightening bolt icon can be produced by older software that misinterpreted the (probably) changed register structures of an PI 3B+, so a lightening icon can mean that you are using incompatible (boot) software with a 3B+.