diff --git a/Docs/Configuration.pdf b/Docs/Configuration.pdf
index a87e8339..275263b7 100644
Binary files a/Docs/Configuration.pdf and b/Docs/Configuration.pdf differ
diff --git a/Docs/Configuration.tex b/Docs/Configuration.tex
index 61984ce6..6e806743 100755
--- a/Docs/Configuration.tex
+++ b/Docs/Configuration.tex
@@ -1737,6 +1737,22 @@ To view their current state, use the \texttt{pmset -g} command in Terminal.
   for 4 MB, and so on up to \texttt{19} for 512 GB. Apple macOS supports
   1 GB maximum, which is \texttt{10}. Use \texttt{-1} to disable this quirk.
 
+  Consider a GPU with 2 BARs:
+  \begin{itemize}
+    \tightlist
+    \item \texttt{BAR0} supports sizes from 256 MB to 8 GB. Its value is 4 GB.
+    \item \texttt{BAR1} supports sizes from 1 MB to 256 MB. Its value is 256 MB.
+  \end{itemize}
+
+  \emph{Example 1}: Setting \texttt{ResizeAppleGpuBars} to 1 GB will change
+  \texttt{BAR0} to 1 GB and leave \texttt{BAR1} unchanged.
+  \\
+  \emph{Example 2}: Setting \texttt{ResizeAppleGpuBars} to 1 MB will change
+  \texttt{BAR0} to 256 MB and \texttt{BAR0} to 1 MB.
+  \\
+  \emph{Example 3}: Setting \texttt{ResizeAppleGpuBars} to 16 GB will make no
+  changes.
+
   \emph{Note}: See \texttt{ResizeGpuBars} quirk for general GPU PCI BAR
   size configuration and more details about the technology.
 
@@ -7701,6 +7717,22 @@ with the boot menu.
   and maximum available (\texttt{ON}). This quirk allows to fine-tune this
   value for testing and development purposes.
 
+  Consider a GPU with 2 BARs:
+  \begin{itemize}
+    \tightlist
+    \item \texttt{BAR0} supports sizes from 256 MB to 8 GB. Its value is 4 GB.
+    \item \texttt{BAR1} supports sizes from 1 MB to 256 MB. Its value is 256 MB.
+  \end{itemize}
+
+  \emph{Example 1}: Setting \texttt{ResizeGpuBars} to 1 GB will change
+  \texttt{BAR0} to 1 GB and leave \texttt{BAR1} unchanged.
+  \\
+  \emph{Example 2}: Setting \texttt{ResizeGpuBars} to 1 MB will change
+  \texttt{BAR0} to 256 MB and \texttt{BAR0} to 1 MB.
+  \\
+  \emph{Example 3}: Setting \texttt{ResizeGpuBars} to 16 GB will change
+  \texttt{BAR0} to 8 GB and leave \texttt{BAR1} unchanged.
+
   \emph{Note 1}: This quirk shall not be used to workaround macOS limitation
   to address BARs over 1 GB. \texttt{ResizeAppleGpuBars} should be used instead.
 
diff --git a/Docs/Differences/Differences.pdf b/Docs/Differences/Differences.pdf
index 964c459c..9b7f5aed 100644
Binary files a/Docs/Differences/Differences.pdf and b/Docs/Differences/Differences.pdf differ
diff --git a/Docs/Differences/Differences.tex b/Docs/Differences/Differences.tex
index 3b6f16f4..c8332dd0 100644
--- a/Docs/Differences/Differences.tex
+++ b/Docs/Differences/Differences.tex
@@ -1,7 +1,7 @@
 \documentclass[]{article}
 %DIF LATEXDIFF DIFFERENCE FILE
 %DIF DEL PreviousConfiguration.tex   Mon Oct 11 00:01:52 2021
-%DIF ADD ../Configuration.tex        Mon Oct 11 04:50:40 2021
+%DIF ADD ../Configuration.tex        Tue Oct 12 02:10:19 2021
 
 \usepackage{lmodern}
 \usepackage{amssymb,amsmath}
@@ -1799,6 +1799,23 @@ To view their current state, use the \texttt{pmset -g} command in Terminal.
   1 GB maximum, which is }\texttt{\DIFadd{10}}\DIFadd{. Use }\texttt{\DIFadd{-1}} \DIFadd{to disable this quirk.
 }
 
+  \DIFadd{Consider a GPU with 2 BARs:
+  }\begin{itemize}
+    \tightlist
+    \item \texttt{\DIFadd{BAR0}} \DIFadd{supports sizes from 256 MB to 8 GB. Its value is 4 GB.
+    }\item \texttt{\DIFadd{BAR1}} \DIFadd{supports sizes from 1 MB to 256 MB. Its value is 256 MB.
+  }\end{itemize}
+
+  \emph{\DIFadd{Example 1}}\DIFadd{: Setting }\texttt{\DIFadd{ResizeAppleGpuBars}} \DIFadd{to 1 GB will change
+  }\texttt{\DIFadd{BAR0}} \DIFadd{to 1 GB and leave }\texttt{\DIFadd{BAR1}} \DIFadd{unchanged.
+  }\\
+  \emph{\DIFadd{Example 2}}\DIFadd{: Setting }\texttt{\DIFadd{ResizeAppleGpuBars}} \DIFadd{to 1 MB will change
+  }\texttt{\DIFadd{BAR0}} \DIFadd{to 256 MB and }\texttt{\DIFadd{BAR0}} \DIFadd{to 1 MB.
+  }\\
+  \emph{\DIFadd{Example 3}}\DIFadd{: Setting }\texttt{\DIFadd{ResizeAppleGpuBars}} \DIFadd{to 16 GB will make no
+  changes.
+}
+
   \emph{\DIFadd{Note}}\DIFadd{: See }\texttt{\DIFadd{ResizeGpuBars}} \DIFadd{quirk for general GPU PCI BAR
   size configuration and more details about the technology.
 }
@@ -7890,6 +7907,23 @@ with }\DIFaddend the \DIFdelbegin \DIFdel{user will need to specify the correct
   value for testing and development purposes.
 }
 
+  \DIFadd{Consider a GPU with 2 BARs:
+  }\begin{itemize}
+    \tightlist
+    \item \texttt{\DIFadd{BAR0}} \DIFadd{supports sizes from 256 MB to 8 GB. Its value is 4 GB.
+    }\item \texttt{\DIFadd{BAR1}} \DIFadd{supports sizes from 1 MB to 256 MB. Its value is 256 MB.
+  }\end{itemize}
+
+  \emph{\DIFadd{Example 1}}\DIFadd{: Setting }\texttt{\DIFadd{ResizeGpuBars}} \DIFadd{to 1 GB will change
+  }\texttt{\DIFadd{BAR0}} \DIFadd{to 1 GB and leave }\texttt{\DIFadd{BAR1}} \DIFadd{unchanged.
+  }\\
+  \emph{\DIFadd{Example 2}}\DIFadd{: Setting }\texttt{\DIFadd{ResizeGpuBars}} \DIFadd{to 1 MB will change
+  }\texttt{\DIFadd{BAR0}} \DIFadd{to 256 MB and }\texttt{\DIFadd{BAR0}} \DIFadd{to 1 MB.
+  }\\
+  \emph{\DIFadd{Example 3}}\DIFadd{: Setting }\texttt{\DIFadd{ResizeGpuBars}} \DIFadd{to 16 GB will change
+  }\texttt{\DIFadd{BAR0}} \DIFadd{to 8 GB and leave }\texttt{\DIFadd{BAR1}} \DIFadd{unchanged.
+}
+
   \emph{\DIFadd{Note 1}}\DIFadd{: This quirk shall not be used to workaround macOS limitation
   to address BARs over 1 GB. }\texttt{\DIFadd{ResizeAppleGpuBars}} \DIFadd{should be used instead.
 }
diff --git a/Docs/Errata/Errata.pdf b/Docs/Errata/Errata.pdf
index 3eed8c82..c5b97e26 100644
Binary files a/Docs/Errata/Errata.pdf and b/Docs/Errata/Errata.pdf differ
diff --git a/Library/OcDeviceMiscLib/SetResizableBar.c b/Library/OcDeviceMiscLib/SetResizableBar.c
index 12e1c818..6809bb3f 100644
--- a/Library/OcDeviceMiscLib/SetResizableBar.c
+++ b/Library/OcDeviceMiscLib/SetResizableBar.c
@@ -213,7 +213,15 @@ SetResizableBarOnDevice (
       NewCapabilities &= PCI_BAR_CAP_LIMIT (Entries[Index].ResizableBarControl.Bits.BarSize);
     }
 
-    Bit = HighBitSet64 (NewCapabilities);
+    //
+    // If requested BAR size is too low, choose the lowest available BAR size.
+    //
+    if (NewCapabilities == 0
+      && Entries[Index].ResizableBarControl.Bits.BarSize > Size) {
+      Bit = LowBitSet64 (Capabilities);
+    } else {
+      Bit = HighBitSet64 (NewCapabilities);
+    }
 
     DEBUG ((
       DEBUG_INFO,