[Tex/LaTex] How to add two two-column figures in the top and bottom of the same page

Question

First I would like to thanks for the support and effort for helping me.
Second is the problem. I'm writting an scientific article for ICEIS 2017 conference (www.iceis.org). It is a two-column article and I need to fit two two-coloum figures at the same page occupying the top, and the bottom of that page (conference restrictions, two-column figures must be at the beginning or end of page). I'm using figure* and the 't' and 'b' parameter. However 'b' is putting my figure at the end of the article along side with the following figures (I don't know why). 't' parameters works fine. Is there any specific page/floats configuration that I should know about?
Illustrating scenario:

bla bla bla bla bla bla (text)
\begin{figure*}[!t]
   \centering
   {\includegraphics[width = 12 cm]{figureA}}
   \caption{Hi! I'm Figure A.}
   \label{fig:figureA}
\end{figure*}
bla bla bla bla bla bla (text)
\begin{figure*}[!b]
   \centering
   {\includegraphics[width = 12 cm]{figureB}}
   \caption{Figure B, thats me!.}
   \label{fig:figureA}
\end{figure*}
bla bla bla bla bla bla (text)

Figure:

Answer 1

The stfloats package provides this functionality

\documentclass[twocolumn]{article}
\usepackage{stfloats}
\usepackage{graphicx}
\begin{document}

bla bla bla bla bla bla (text)
\begin{figure*}[t]
   \centering
   \includegraphics[width = 6 cm]{example-image-a}
   \caption{Hi! I'm Figure A.}
   \label{fig:figureA}
\end{figure*}
\begin{figure*}[b]
   \centering
   \includegraphics[width = 6 cm]{example-image-b}
   \caption{Figure B, thats me!.}
   \label{fig:figureB}
\end{figure*}

\def\a{bla bla bla bla bla bla (text)}
\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a
\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a
\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a

zzz \a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a
\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a
\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a\a

\end{document}