SharePoint: Master Page is not updating with feature after deployment

I noticed below points while working with master page

If master page is not customized, I mean if it is not modified by SharePoint designer or any other tool

  2^nd time when I am done with modifications in my feature code, I am updating a master page feature    using below powershell script

update-spsolution -identity MasterPages.wsp  -literalpath C:\Pulipati\.MasterPages.wsp  -  gacdeployment

a.    My Master page is updating properly however it is not creating a version and it is not updating the modified date as well when I run above command.  But when I open a master page I see latest code.

If master page is customized, I mean if it is modified by SharePoint designer or any other tool

  If I run powershell command it is not updating my master page. So I followed this Post and successfully updated.

<Module Name="PGCMasterPageModule" List="116" Url="_catalogs/masterpage">

  <File Path="xxxMasterPageModule\CustomMaster.master" Url="CustomMaster.master"  IgnoreIfAlreadyExists="TRUE" Type="GhostableInLibrary" />

</Module>

IgnoreIfAlreadyExists="TRUE": always make this TRUE it will not throw any error when you deploy second time.

using System.IO;

  public override void FeatureActivated(SPFeatureReceiverProperties properties)

        {

            //if you want to debug just enable this code

            // System.Diagnostics.Debugger.Break();

            SPSite currentSite = (SPSite)properties.Feature.Parent;

            SPWeb oCurrentWeb = currentSite.RootWeb;

           oCurrentWeb.MasterUrl = oCurrentWeb.ServerRelativeUrl +    "/_catalogs/masterpage/CustomMaster.master";

            oCurrentWeb.CustomMasterUrl = oCurrentWeb.ServerRelativeUrl + "/_catalogs/masterpage/CustomMaster.master";

            oCurrentWeb.Update();

//below code executes only when the file is customized (for ex: if u modify with sharepoint designer) 

       if (oFile.CustomizedPageStatus == SPCustomizedPageStatus.Customized)

            {

                

            // Here we are trying to overwrite the default.master  

            SPFile oFile = oCurrentWeb.GetFile("_catalogs/masterpage/CustomMaster.master");

            SPFolder oFolder = oCurrentWeb.Lists["Master Page Gallery"].RootFolder;

            // Check In the file  

            if (oFile.CheckOutType != SPFile.SPCheckOutType.None)

                oFile.CheckIn("auto checkin");

            // Check Out the file for edit.  

            oFile.CheckOut();

            string directory = properties.Definition.RootDirectory; // it returns 14 hive feature path

            directory += @"\PGCMasterPageModule"; // my feature module name as shown in picture

            // Get the master page name from the feature properties as defined in the elements.xml 

            //  SPFeatureProperty oPropertyName = properties.Feature.Properties["CustomMaster.master"];

            // Get the file names from the specified directory matching the feature property value. 

            string[] templates = Directory.GetFiles(directory, "CustomMaster.master", System.IO.SearchOption.TopDirectoryOnly);

            // templates should have all the matching file names. In this instance it whould be only one file name. 

            string MasterPageFile = templates[0];

            FileInfo fileInfo = new FileInfo(MasterPageFile);

            byte[] byteArr = System.IO.File.ReadAllBytes(MasterPageFile);

            oFolder.Files.Add(fileInfo.Name, byteArr, true);

            oFile.Update();

            oFile.CheckIn("Check in");

            oFile.Publish("Published");

            oFile.Approve("Approved");

        }


}