diff --git a/BaseTools/Source/Python/FMMT/core/FMMTOperation.py b/BaseTools/Source/Python/FMMT/core/FMMTOperation.py
index a86f8dda9a..d4aa339703 100644
--- a/BaseTools/Source/Python/FMMT/core/FMMTOperation.py
+++ b/BaseTools/Source/Python/FMMT/core/FMMTOperation.py
@@ -188,7 +188,7 @@ def ExtractFfs(inputfile: str, Ffs_name: str, outputfile: str, Fv_name: str=None
                 FmmtParser.WholeFvTree.Findlist.remove(FmmtParser.WholeFvTree.Findlist[index])
     if FmmtParser.WholeFvTree.Findlist != []:
         TargetNode = FmmtParser.WholeFvTree.Findlist[0]
-        if TargetNode.type == FV_TREE or SEC_FV_TREE or DATA_FV_TREE:
+        if TargetNode.type == FV_TREE or TargetNode.type == SEC_FV_TREE or TargetNode.type == DATA_FV_TREE:
             FinalData = struct2stream(TargetNode.Data.Header) + TargetNode.Data.Data
             with open(outputfile, "wb") as f:
                 f.write(FinalData)
diff --git a/BaseTools/Source/Python/FMMT/core/FvHandler.py b/BaseTools/Source/Python/FMMT/core/FvHandler.py
index c7aca95bf2..7a60760336 100644
--- a/BaseTools/Source/Python/FMMT/core/FvHandler.py
+++ b/BaseTools/Source/Python/FMMT/core/FvHandler.py
@@ -279,7 +279,7 @@ class FvHandler:
                             ParTree.Child.remove(ParTree.Child[-1])
                             ParTree.Data.Free_Space = 0
                         ParTree.Data.Size += Needed_Space
-                        ParTree.Data.Header.Fvlength = ParTree.Data.Size
+                        ParTree.Data.Header.FvLength = ParTree.Data.Size
                 ModifyFvSystemGuid(ParTree)
                 for item in ParTree.Child:
                     if item.type == FFS_FREE_SPACE:
@@ -663,8 +663,12 @@ class FvHandler:
             Removed_Space = TargetFv.Data.Free_Space - New_Free_Space
             TargetFv.Child[-1].Data.Data = b'\xff' * New_Free_Space
             TargetFv.Data.Size -= Removed_Space
-            TargetFv.Data.Header.Fvlength = TargetFv.Data.Size
-            ModifyFvSystemGuid(TargetFv)
+            TargetFv.Data.Header.FvLength = TargetFv.Data.Size
+            if struct2stream(TargetFv.Data.Header.FileSystemGuid) == EFI_FIRMWARE_FILE_SYSTEM3_GUID_BYTE:
+                if TargetFv.Data.Size <= 0xFFFFFF:
+                    TargetFv.Data.Header.FileSystemGuid = ModifyGuidFormat(
+                        "8c8ce578-8a3d-4f1c-9935-896185c32dd3")
+
             for item in TargetFv.Child:
                 if item.type == FFS_FREE_SPACE:
                     TargetFv.Data.Data += item.Data.Data + item.Data.PadData