diff --git a/README.md b/README.md
index 237fc9f..426d0dc 100644
--- a/README.md
+++ b/README.md
@@ -2,10 +2,12 @@
 
 Build  an iso with all your deb favorite package and you personnal files in it. With dependencies.
 
+## Concepts
+
 Those scripts are intended to customise an existing debian installer iso.
 
 The initial idea is to anticipate the end of i386 architecture ( bookworm is the last release to include this architecture ) and be able to reinstall i386 hosts in the future with the last existing release even in future (retroxxxx).
-Those servers will no more have security fixes, so a local usage is recommanded.
+Those servers will no more have security fixes, so a local/offline usage is recommanded.
 
 The goals are :
 
@@ -22,6 +24,8 @@ You may also include :
 - suggested packages of a package
 - suggestions from popcon
 
+## Requirements
+
 It doesn't need admin rights but apt should be configured properly.
 If you want to include a package in contrib, contrib must be available in sources.list.
 
@@ -35,6 +39,8 @@ Adjust wanted.txt, excluded.txt and exclude_tags.txt to your needs.
 
 Execute customize_iso.sh with the iso as argument.
 
+## Internal
+
 customize_iso.sh :
 
 - mount iso as temp
@@ -43,9 +49,11 @@ customize_iso.sh :
 - copy the downloaded packages
 - generate the custom iso you can write on a disk or a usb key
 
-You can adjust it tou your needs.
 
-$ customize_iso.sh debian-12.12.0-i386-netinst.iso
+In offline mode, the custom iso provide a script local-apt-repository.sh that automatically :
+
+- allow install of packages from installation medium (apt-cdrom)
+- install and configure local-apt-repository to install packages you added to the medium
 
 download_myfiles.py :
 
@@ -54,4 +62,29 @@ download_myfiles.py :
 - ask to include recommanded, suggested and popcon packages
 - simulate an apt cache to integrate all dependencies
 
-The custom iso include scripts to use local-apt-repository package after installation for a good apt experience.
+The script download_myfiles.py may be used by itself if you provide the needed arguments.
+
+You can add a preseed to automate the installation.
+
+You can add a script to custom manually :
+
+- add firmwares, add zips
+- add scripts on the medium to automate post-installation ( add user, add files )
+
+## Known bugs
+
+The script **download_myfiles.py** use apt to search for dependencies. Dependencies is a complex subject, and some dependencies may give some problems : virtual packages and or_dependency.
+
+To avoid them, don't ask for virtual packages.
+And provide the or_dependency you want. But the script will continue to try to download **all** or_dependencies ...
+
+You can refuse to install the recommanded/suggested packages you don't want or exclude them directly in the excluded file ... But yes it's a bug :( .
+
+## Usage
+
+You can give some arguments to the script (--help) but the most controlled usage is :
+
+```bash
+$ bash customize_iso.sh --configfile myconfigfile.conf
+...
+```
diff --git a/lfs.sh b/lfs.sh
index 8c532f1..b9406bf 100644
--- a/lfs.sh
+++ b/lfs.sh
@@ -32,6 +32,13 @@ EOF
 apt --yes install texinfo m4 bison gawk make patch python3 xz-utils gcc g++ build-essential
 
 mv --verbose /etc/bash.bashrc /etc/bash.bashrc.NOUSE
+pushd /bin || return 1
+    if [[ $(readlink sh) =~ ^dash$ ]]
+    then
+        rm --verbose sh
+        ln --symbolic --verbose bash sh
+    fi
+popd || return 1
 
 cat > /home/lfs/.lfsbuild_config <<"EOCF"
 # build directory
@@ -52,7 +59,8 @@ LFS_NETWORKOFFLINE=true
 LFS_LINUXCONFIGPROVIDED=true
 EOCF
 
+
 chown lfs:lfs /home/lfs/.lfsbuild_config
-find /home/lfs/lfs_archives_13_0/ -name "cclfs*.tar.gz" -exec tar --extract --gunzip --file={} --directory=/home/lfs/ \;
+find /media/cdrom/lfs_archives_13_0/ -name "cclfs*.tar.gz" -exec tar --extract --gunzip --file={} --directory=/home/lfs/ \;
 
 EOPF
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