commit 8a71a1989847542e74f92fa2898180df058673c1
Author: dany <danyscheffler@icloud.com>
Date:   Fri Jul 25 16:17:59 2025 +0200

    initial commit

diff --git a/README.md b/README.md
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+Start by downloading the El Capitan dmg from this link : https://support.apple.com/en-us/HT211683
+
+Then open the dmg and copy InstallMacOSX.pkg on the Desktop.
+
+Then, from the terminal (Applications/Utilities) un-compact the InstallMacOSX.pkg file in a directory (Installer for example) which will be created by the following pkgutil command:
+
+```
+$ pkgutil --expand ~/Desktop/InstallMacOSX.pkg ~/Desktop/Installer
+```
+
+Then position yourself in the InstallMacOSX.pkg "package" created by the pkgutil command
+
+```
+$ cd ~/Desktop/Installer/InstallMacOSX.pkg
+```
+
+Then un-compact the structure using the tar command:
+
+```
+$ tar -xvf Payload
+```
+
+Finally move the InstallESD.dmg file created by the tar command above to the Desktop
+
+```
+$ mv InstallESD.dmg ~/Desktop
+```
+
+Execute the following instructions to create correct disk image:
+
+```
+$ hdiutil attach ~/Desktop/InstallESD.dmg -noverify -nobrowse -mountpoint /Volumes/install_app
+$ hdiutil convert /Volumes/install_app/BaseSystem.dmg -format UDSP -o /tmp/Installer
+$ hdiutil resize -size 8g /tmp/Installer.sparseimage
+$ hdiutil attach /tmp/Installer.sparseimage -noverify -nobrowse -mountpoint /Volumes/install_build
+$ rm -r /Volumes/install_build/System/Installation/Packages
+$ cp -av /Volumes/install_app/Packages /Volumes/install_build/System/Installation/
+$ cp -av /Volumes/install_app/BaseSystem.chunklist /Volumes/install_build
+$ cp -av /Volumes/install_app/BaseSystem.dmg /Volumes/install_build
+$ hdiutil detach /Volumes/install_app
+$ hdiutil detach /Volumes/install_build
+$ hdiutil resize -size `hdiutil resize -limits /tmp/Installer.sparseimage | tail -n 1 | awk '{print $ 1}' `b /tmp/Installer.sparseimage
+$ hdiutil convert /tmp/Installer.sparseimage -format UDZO -o /tmp/Installer
+$ mv /tmp/Installer.dmg ~/Desktop
+```
+
+You must then format a GUID partition scheme USB key of sufficient size (8 GB for El Capitan) named KEY in the example and you have to plug the USB key named KEY, then :
+
+```
+$ sudo asr restore --source ~/Desktop/Installer.dmg --target /Volumes/KEY --noprompt --noverify --erase
+```
+
+Test the key and if ok, delete the working directories and files of this operation from the Desktop.