--- a/testing/mozharness/configs/merge_day/beta_to_release.py
+++ b/testing/mozharness/configs/merge_day/beta_to_release.py
@@ -1,21 +1,22 @@
 config = {
     "log_name": "beta_to_release",
-    "version_files": [
-        {"file": "browser/config/version.txt", "suffix": ""},
-        {"file": "browser/config/version_display.txt", "suffix": ""},
-        {"file": "config/milestone.txt", "suffix": ""},
+    "copy_files": [
+        {
+            "src": "browser/config/version.txt",
+            "dst": "browser/config/version_display.txt",
+        },
     ],
     "replacements": [
         # File, from, to
         ("{}/{}".format(d, f),
         "ac_add_options --with-branding=mobile/android/branding/beta",
         "ac_add_options --with-branding=mobile/android/branding/official")
-        for d in ["mobile/android/config/mozconfigs/android-api-11/",
+        for d in ["mobile/android/config/mozconfigs/android-api-15/",
                   "mobile/android/config/mozconfigs/android-api-9-10-constrained/",
                   "mobile/android/config/mozconfigs/android-x86/"]
         for f in ["debug", "nightly", "l10n-nightly", "l10n-release", "release"]
     ] + [
         # File, from, to
         ("browser/confvars.sh",
          "ACCEPTED_MAR_CHANNEL_IDS=firefox-mozilla-beta,firefox-mozilla-release",
          "ACCEPTED_MAR_CHANNEL_IDS=firefox-mozilla-release"),
@@ -43,8 +44,9 @@ config = {
         "requests==2.8.1",
     ],
 
     "post_merge_builders": [],
     "post_merge_nightly_branches": [
         # No nightlies on mozilla-release
     ],
 }
+

--- a/testing/mozharness/scripts/merge_day/gecko_migration.py
+++ b/testing/mozharness/scripts/merge_day/gecko_migration.py
@@ -365,16 +365,22 @@ class GeckoMigration(MercurialScript, Ba
         """ mozilla-beta -> mozilla-release behavior.
 
             We could have all of these individually toggled by flags, but
             by separating into workflow methods we can be more precise about
             what happens in each workflow, while allowing for things like
             staging beta user repo migrations.
             """
         dirs = self.query_abs_dirs()
+        # Reset display_version.txt
+        for f in self.config["copy_files"]:
+            self.copyfile(
+                os.path.join(dirs['abs_to_dir'], f["src"]),
+                os.path.join(dirs['abs_to_dir'], f["dst"]))
+
         self.apply_replacements()
         if self.config.get("remove_locales"):
             self.remove_locales(
                 os.path.join(dirs['abs_to_dir'], "browser/locales/shipped-locales"),
                 self.config['remove_locales']
             )
         self.touch_clobber_file(dirs['abs_to_dir'])