Fixing section numbers to alphabet letters with \theHsection

Question

I researched, and I am having a similar trouble to this one: Reset section numbering between unnumbered chapters

My problem is the following. I am using koma-script book class. I want to use \chapter* for Appendices, so that it doesn't say Chapter 7 after having six chapters. In particular, after the end of Chapter 6, I have the following.

\newpage
\phantomsection
\addcontentsline{toc}{chapter}{Appendices}
\chapter*{Appendices}
\setcounter{section}{0}
\renewcommand{\thesection}{\Alph{section}}
\section{Title of appendix A}
\section{Title of appendix B}
\section{Title of appendix C}

Now, the above code allows me to put A, B, C for each appendix, but hyperref bookmarks are messed up (same as the issue of the link). So instead of

\renewcommand{\thesection}{\Alph{section}}

I tried with

\renewcommand{\theHsection}{\Alph{section}}

This fixes hyperref links, but it puts 6.1, 6.2, 6.3 instead of A, B, C for each of my appendix. How can I use the alphabet instead of numbers together with \theHsection?

Edited:

Please look at the following code:

\documentclass[paper=letter, fontsize=11pt, chapterprefix=on, oneside]{scrbook}
\usepackage{hyperref}
\renewcommand{\thesection}{\thechapter.\arabic{section}}

\begin{document}
\tableofcontents

\chapter{First numbered chapter}
\section{AB}
\section{BC}
\section{DE}

\newpage
\phantomsection
\addcontentsline{toc}{chapter}{Appendices}
\chapter*{Appendices}
\setcounter{section}{0}
\renewcommand{\thesection}{\Alph{section}}
\section{Title of appendix A}
\section{Title of appendix B}
\section{Title of appendix C}
\end{document}

With this, bookmarks of "Title of appendix A", for example, is at the wrong location. It refers to "1.1 AB" when I want it to refer to "A. Title of appendix A."

So I change \renewcommand{\thesection}{\Alph{section}} to \renewcommand{\theHsection}{\Alph{section}}. Then bookmarks are all correct, but it now puts "1.1 Title of appendix A."

Answer 1

The problem is that after the section values occur again and the current chapter value is still 1 (in this document version here).

This confuses hyperref, since it uses again section. as prefix for the anchors. Changing \theHsection to apply another prefix, say appendixsection. cures the problem.

\documentclass[paper=letter, fontsize=11pt, chapterprefix=on, oneside]{scrbook}
\renewcommand{\thesection}{\thechapter.\arabic{section}}
\usepackage{hyperref}

\usepackage{blindtext}

\begin{document}
\tableofcontents

\chapter{First numbered chapter}
\section{AB}
\section{BC}
\section{DE}

\newpage
\phantomsection
\addcontentsline{toc}{chapter}{Appendices}
\chapter*{Appendices}
\setcounter{section}{0}
\renewcommand{\thesection}{\Alph{section}}
\renewcommand{\theHsection}{appendixsection.\Alph{section}}
\section{Title of appendix A}
\blindtext[5]
\section{Title of appendix B}
\blindtext[5]
\section{Title of appendix C}
\blindtext[5]
\end{document}