MP 1,1-5,1 How to apply "SECURITY UPDATE 2018-004" on Mac Pro 2,1 with El Capitan?

[Felpa]

Hello.

I have a Mac Pro 2,1 with Snow Leopard 10.6.8
It is working nice

From Snow Leopard, I've restored an "El Capitan" DMG with a 32 bit "boot.efi" (from "Hrutkay Mods")
It worked perfectly

Then, I've tried applying the "SECURITY UPDATE 2018-004".
"El Capitan" broke, after the restart

I've tried replace the boot.efi from the working one (Hrutkay's dmg), but it didn't work out:
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cd '/Volumes/El Capitan/System/Library/CoreServices/'
sudo chflags nouchg boot.efi
cd '/Volumes/El Capitan/usr/standalone/i386/'
sudo chflags nouchg boot.efi

sudo cp '/Volumes/El Capitan Hrutkay DMG/System/Library/CoreServices/boot.efi' '/Volumes/El Capitan/System/Library/CoreServices/'
sudo cp '/Volumes/El Capitan Hrutkay DMG/System/Library/CoreServices/boot.efi' '/Volumes/El Capitan/usr/standalone/i386/'
sudo rm -f Firmware.scap

cd '/Volumes/El Capitan/System/Library/CoreServices/'
sudo chown root:wheel boot.efi
cd '/Volumes/El Capitan/usr/standalone/i386/'
sudo chown root:wheel boot.efi
==============================

I've got to retore Hrutkay's El Capitan again.
Now its running fine, again, but without any "SECURITY UPDATE".

Any idea on how to apply this update, without breaking the OS?

Thanks.

 

[reader50]

Assuming you have both installs handy for troubleshooting. Try making a copy of this file, from your working ElCap install:

/System/Library/PrelinkedKernels/prelinkedkernel

Copy it across to your updated El Capitan install, replacing the copy provided by the security update.

From Yosemite on, the OS saves a copy of the running kernel. Then boots from that, instead of building from the boot kernel up. It makes for faster booting to cache the whole thing. But when your machine needs a patched macOS version, you may be trying to boot from a cached vanilla copy provided from the security update.