How to replace boot.efi with mine

Pike's Universum

El Capitan now runs on unsupported hardware, but that was only step one. We have a few more hurdles to take. Let’s start with the installation process. Take a look at this snippet from ia.log:

Extracting boot files from /Volumes/OS X Install ESD/BaseSystem.dmg
Extracting Boot Bits from Inner DMG:
Copied prelinkedkernel
Copied Boot.efi
Copied PlatformSupport.plist
Ejecting disk images
Generating the com.apple.Boot.plist file
com.apple.Boot.plist: {
	    "Kernel Cache" = "/.IABootFiles/prelinkedkernel";
	    "Kernel Flags" = "container-dmg=file:///Applications/Install%20OS%20X%2010.11.1.app/Contents/SharedSupport/InstallESD.dmg root-dmg=file:///BaseSystem.dmg";
	}
Done generating the com.apple.Boot.plist file
Blessing /Volumes/MacintoshHD -- /Volumes/MacintoshHD/.IABootFiles

After which the InstallAssistantTool takes over:

Blessing Mount Point:/Volumes/MacintoshHD Folder:/Volumes/MacintoshHD/.IABootFiles plist:com.apple.Boot.plist
***************************** Setting Startup Disk *****************************
******           Path: /Volumes/MacintoshHD
******     Boot Plist: /Volumes/MacintoshHD/.IABootFiles/com.apple.Boot.plist
/usr/sbin/bless -setBoot -folder /Volumes/MacintoshHD/.IABootFiles -bootefi /Volumes/MacintoshHD/.IABootFiles/boot.efi -options config=".IABootFilescom.apple.Boot" -label OS X Installer
Bless on /Volumes/MacintoshHD succeeded

Note: The boot drive (ElCapitanSSD) had El Capitan 10.11.1 installed on it and the target drive (MacintoshHD) had Yosemite 10.10.5 installed on it.

But if I install El…

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