diff --git a/config-HEDT/nehalem.md b/config-HEDT/nehalem.md
index 3d4c61424..29b76acca 100644
--- a/config-HEDT/nehalem.md
+++ b/config-HEDT/nehalem.md
@@ -87,6 +87,7 @@ Settings relating to boot.efi patching and firmware fixes, depending where your
 | AvoidRuntimeDefrag | No | Big Sur may require this quirk enabled |
 | EnableSafeModeSlide | No | |
 | EnableWriteUnprotector | No | |
+| FixupAppleEfiImages | Yes | This is required to boot OS X 10.4 through 10.12 |
 | ProvideCustomSlide | No | |
 | RebuildAppleMemoryMap | Yes | This is required to boot OS X 10.4 through 10.6 |
 | SetupVirtualMap | No | |
@@ -107,6 +108,9 @@ Settings relating to boot.efi patching and firmware fixes, depending where your
   * Enables slide variables to be used in safe mode.
 * **EnableWriteUnprotector**: YES
   * Needed to remove write protection from CR0 register on UEFI platforms
+* **FixupAppleEfiImages**: YES
+  * Fixes errors in macOS's boot.efi, needed for machines using DuetPkg
+  * Not needed when booting macOS 10.13+ with SecureBootModel enabled
 * **ProvideCustomSlide**: YES
   * Used for Slide variable calculation. However the necessity of this quirk is determined by `OCABC: Only N/256 slide values are usable!` message in the debug log. If the message `OCABC: All slides are usable! You can disable ProvideCustomSlide!` is present in your log, you can disable `ProvideCustomSlide`.
 * **RebuildAppleMemoryMap**: YES
diff --git a/config-laptop.plist/arrandale.md b/config-laptop.plist/arrandale.md
index 1f3a2438c..8e8338477 100644
--- a/config-laptop.plist/arrandale.md
+++ b/config-laptop.plist/arrandale.md
@@ -104,6 +104,7 @@ Settings relating to boot.efi patching and firmware fixes, depending where your
 | AvoidRuntimeDefrag | No | Big Sur may require this quirk enabled |
 | EnableSafeModeSlide | No | |
 | EnableWriteUnprotector | No | |
+| FixupAppleEfiImages | Yes | This is required to boot OS X 10.4 through 10.12 |
 | ProvideCustomSlide | No | |
 | RebuildAppleMemoryMap | Yes | This is required to boot OS X 10.4 through 10.6 |
 | SetupVirtualMap | No | |
@@ -124,6 +125,9 @@ Settings relating to boot.efi patching and firmware fixes, depending where your
   * Enables slide variables to be used in safe mode.
 * **EnableWriteUnprotector**: NO
   * Needed to remove write protection from CR0 register.
+* **FixupAppleEfiImages**: YES
+  * Fixes errors in macOS's boot.efi, needed for machines using DuetPkg
+  * Not needed when booting macOS 10.13+ with SecureBootModel enabled
 * **ProvideCustomSlide**: YES
   * Used for Slide variable calculation. However the necessity of this quirk is determined by `OCABC: Only N/256 slide values are usable!` message in the debug log. If the message `OCABC: All slides are usable! You can disable ProvideCustomSlide!` is present in your log, you can disable `ProvideCustomSlide`.
 * **RebuildAppleMemoryMap**: YES
diff --git a/config.plist/clarkdale.md b/config.plist/clarkdale.md
index ce9132275..e2722807d 100644
--- a/config.plist/clarkdale.md
+++ b/config.plist/clarkdale.md
@@ -89,6 +89,7 @@ Settings relating to boot.efi patching and firmware fixes, depending where your
 | AvoidRuntimeDefrag | No | Big Sur may require this quirk enabled |
 | EnableSafeModeSlide | No | |
 | EnableWriteUnprotector | No | |
+| FixupAppleEfiImages | Yes | This is required to boot OS X 10.4 through 10.12 |
 | ProvideCustomSlide | No | |
 | RebuildAppleMemoryMap | Yes | This is required to boot OS X 10.4 through 10.6 |
 | SetupVirtualMap | No | |
@@ -109,6 +110,9 @@ Settings relating to boot.efi patching and firmware fixes, depending where your
   * Enables slide variables to be used in safe mode.
 * **EnableWriteUnprotector**: NO
   * Needed to remove write protection from CR0 register.
+* **FixupAppleEfiImages**: YES
+  * Fixes errors in macOS's boot.efi, needed for machines using DuetPkg
+  * Not needed when booting macOS 10.13+ with SecureBootModel enabled
 * **ProvideCustomSlide**: YES
   * Used for Slide variable calculation. However the necessity of this quirk is determined by `OCABC: Only N/256 slide values are usable!` message in the debug log. If the message `OCABC: All slides are usable! You can disable ProvideCustomSlide!` is present in your log, you can disable `ProvideCustomSlide`.
 * **RebuildAppleMemoryMap**: YES
diff --git a/config.plist/penryn.md b/config.plist/penryn.md
index 23e7e01ec..630ea93b0 100644
--- a/config.plist/penryn.md
+++ b/config.plist/penryn.md
@@ -88,6 +88,7 @@ Settings relating to boot.efi patching and firmware fixes, depending where your
 | AvoidRuntimeDefrag | No | Big Sur may require this quirk enabled |
 | EnableSafeModeSlide | No | |
 | EnableWriteUnprotector | No | |
+| FixupAppleEfiImages | Yes | This is required to boot OS X 10.4 through 10.12 |
 | ProvideCustomSlide | No | |
 | RebuildAppleMemoryMap | Yes | This is required to boot OS X 10.4 through 10.6 |
 | SetupVirtualMap | No | |
@@ -108,6 +109,12 @@ Settings relating to boot.efi patching and firmware fixes, depending where your
   * Enables slide variables to be used in safe mode.
 * **EnableWriteUnprotector**: NO
   * Needed to remove write protection from CR0 register on UEFI platforms.
+* **FixupAppleEfiImages**: YES
+  * Fixes errors in macOS's boot.efi, needed for machines using DuetPkg
+  * Not needed when booting macOS 10.13+ with SecureBootModel enabled
+* **FixupAppleEfiImages**: YES
+  * Fixes errors in macOS's boot.efi, needed for machines using DuetPkg
+  * Not needed when booting macOS 10.13+ with SecureBootModel enabled
 * **ProvideCustomSlide**: YES
   * Used for Slide variable calculation. However the necessity of this quirk is determined by `OCABC: Only N/256 slide values are usable!` message in the debug log. If the message `OCABC: All slides are usable! You can disable ProvideCustomSlide!` is present in your log, you can disable `ProvideCustomSlide`.
 * **RebuildAppleMemoryMap**: YES