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Sub UpdateDocuments()
Application.ScreenUpdating = False
Dim strFolder As String, strFile As String, strDocNm As String
Dim wdDoc As Document, Rng As Range, Sctn As Section, HdFt As HeaderFooter
strDocNm = ActiveDocument.FullName
strFolder = GetFolder
If strFolder = "" Then Exit Sub
strFile = Dir(strFolder & "\*.doc", vbNormal)
While strFile <> ""
  If strFolder & "\" & strFile <> strDocNm Then
    Set wdDoc = Documents.Open(FileName:=strFolder & "\" & strFile, _
    AddToRecentFiles:=False, Visible:=False)
    With wdDoc
    For Each Sctn In .Sections
        For Each HdFt In Sctn.Headers
        If Sctn.Index = 1 Then
            Set Rng = HdFt.Range
            Call ReplaceShape(Rng)
        ElseIf HdFt.LinkToPrevious = False Then
            Set Rng = HdFt.Range
            Call ReplaceShape(Rng)
        End If
        Next
    Next
    .Close SaveChanges:=True
    End With
  End If
  strFile = Dir()
Wend
Set wdDoc = Nothing
Application.ScreenUpdating = True
End Sub
Sub ReplaceShape(Rng As Range)
Dim sngWdth As Single, SngHght As Single
With Rng
  If .InlineShapes.Count > 0 Then
    Set Rng = .InlineShapes(1).Range
    With .InlineShapes(1)
    sngWdth = .Width
    SngHght = .Height
    .Delete
    End With
    .InlineShapes.AddPicture FileName:="path\to\image.jpg", LinkToFile:=False, SaveWithDocument:=True, Range:=Rng
    With .InlineShapes(1)
    .Width = sngWdth
    .Height = SngHght
    End With
  End If
End With
End Sub
Function GetFolder() As String
Dim oFolder As Object
GetFolder = ""
Set oFolder = CreateObject("Shell.Application").BrowseForFolder(0, "Choose a folder", 0)
If (Not oFolder Is Nothing) Then GetFolder = oFolder.Items.Item.Path
Set oFolder = Nothing
End Function

Sub Update_docx_File_Brand()
Application.ScreenUpdating = False
Dim strFolder As String, strFile As String, wdDoc
strFolder = GetFolder
If strFolder = "" Then Exit Sub
strFile = Dir(strFolder & "\*.docx", vbNormal)
While strFile <> ""
  Set wdDoc = Documents.Open(FileName:=strFolder & "\" & strFile, AddToRecentFiles:=False, Visible:=False)
  With wdDoc.Range.Find
    .ClearFormatting
    .Text = "text"
    .Replacement.Text = "new text"
    .Forward = True
    .Wrap = wdFindContinue
    .Format = False
    .MatchCase = True
    .MatchWholeWord = True
    .MatchWildcards = False
    .MatchSoundsLike = False
    .MatchAllWordForms = False
    .Execute Replace:=wdReplaceAll
  End With
  RTFDoc.Close SaveChanges:=True
  strFile = Dir()
Wend
Set RTFDoc = Nothing
Application.ScreenUpdating = True
End Sub


Sub process()

Call UpdateDocuments
Call Update_docx_File_Brand

End Sub