diff --git a/core/java/android/content/pm/IPackageManager.aidl b/core/java/android/content/pm/IPackageManager.aidl
index 03e600ed3ba18..c988fa907f867 100644
--- a/core/java/android/content/pm/IPackageManager.aidl
+++ b/core/java/android/content/pm/IPackageManager.aidl
@@ -598,8 +598,6 @@ interface IPackageManager {
     boolean setApplicationHiddenSettingAsUser(String packageName, boolean hidden, int userId);
     boolean getApplicationHiddenSettingAsUser(String packageName, int userId);
 
-    boolean setSystemAppInstallState(String packageName, boolean installed, int userId);
-
     IPackageInstaller getPackageInstaller();
 
     boolean setBlockUninstallForUser(String packageName, boolean blockUninstall, int userId);
diff --git a/core/java/android/content/pm/PackageManager.java b/core/java/android/content/pm/PackageManager.java
index 15aedd7cf5023..c3548e5b2bbae 100644
--- a/core/java/android/content/pm/PackageManager.java
+++ b/core/java/android/content/pm/PackageManager.java
@@ -147,7 +147,6 @@ public abstract class PackageManager {
             GET_DISABLED_COMPONENTS,
             GET_DISABLED_UNTIL_USED_COMPONENTS,
             GET_UNINSTALLED_PACKAGES,
-            MATCH_HIDDEN_UNTIL_INSTALLED_COMPONENTS,
     })
     @Retention(RetentionPolicy.SOURCE)
     public @interface PackageInfoFlags {}
@@ -165,7 +164,6 @@ public abstract class PackageManager {
             MATCH_STATIC_SHARED_LIBRARIES,
             GET_DISABLED_UNTIL_USED_COMPONENTS,
             GET_UNINSTALLED_PACKAGES,
-            MATCH_HIDDEN_UNTIL_INSTALLED_COMPONENTS,
     })
     @Retention(RetentionPolicy.SOURCE)
     public @interface ApplicationInfoFlags {}
@@ -522,12 +520,6 @@ public abstract class PackageManager {
      */
     public static final int MATCH_DEBUG_TRIAGED_MISSING = 0x10000000;
 
-    /**
-     * Internal flag used to indicate that a package is a hidden system app.
-     * @hide
-     */
-    public static final int MATCH_HIDDEN_UNTIL_INSTALLED_COMPONENTS =  0x20000000;
-
     /**
      * Flag for {@link #addCrossProfileIntentFilter}: if this flag is set: when
      * resolving an intent that matches the {@code CrossProfileIntentFilter},
@@ -4847,8 +4839,7 @@ public abstract class PackageManager {
      * on the system for other users, also install it for the specified user.
      * @hide
      */
-    @RequiresPermission(anyOf = {
-            Manifest.permission.INSTALL_EXISTING_PACKAGES,
+     @RequiresPermission(anyOf = {
             Manifest.permission.INSTALL_PACKAGES,
             Manifest.permission.INTERACT_ACROSS_USERS_FULL})
     public abstract int installExistingPackageAsUser(String packageName, @UserIdInt int userId)
diff --git a/core/java/android/content/pm/PackageParser.java b/core/java/android/content/pm/PackageParser.java
index b8eb074d16360..2da2cb4c92853 100644
--- a/core/java/android/content/pm/PackageParser.java
+++ b/core/java/android/content/pm/PackageParser.java
@@ -639,19 +639,11 @@ public class PackageParser {
      */
     private static boolean checkUseInstalledOrHidden(int flags, PackageUserState state,
             ApplicationInfo appInfo) {
-        // Returns false if the package is hidden system app until installed.
-        if ((flags & PackageManager.MATCH_HIDDEN_UNTIL_INSTALLED_COMPONENTS) == 0
-                && !state.installed
-                && appInfo != null && appInfo.isSystemApp()) {
-            return false;
-        }
-
         // If available for the target user, or trying to match uninstalled packages and it's
         // a system app.
         return state.isAvailable(flags)
                 || (appInfo != null && appInfo.isSystemApp()
-                        && ((flags & PackageManager.MATCH_KNOWN_PACKAGES) != 0
-                        || (flags & PackageManager.MATCH_HIDDEN_UNTIL_INSTALLED_COMPONENTS) != 0));
+                        && (flags & PackageManager.MATCH_KNOWN_PACKAGES) != 0);
     }
 
     public static boolean isAvailable(PackageUserState state) {
diff --git a/core/res/AndroidManifest.xml b/core/res/AndroidManifest.xml
index 19e5e21d50935..e35b63113f596 100644
--- a/core/res/AndroidManifest.xml
+++ b/core/res/AndroidManifest.xml
@@ -3024,15 +3024,6 @@
     <permission android:name="android.permission.INSTALL_PACKAGE_UPDATES"
         android:protectionLevel="signature|privileged" />
 
-    <!-- Allows an application to install existing system packages. This is a limited
-         version of {@link android.Manifest.permission#INSTALL_PACKAGES}.
-         <p>Not for use by third-party applications.
-         TODO(b/80204953): remove this permission once we have a long-term solution.
-         @hide
-    -->
-    <permission android:name="com.android.permission.INSTALL_EXISTING_PACKAGES"
-        android:protectionLevel="signature|privileged" />
-
     <!-- @SystemApi Allows an application to clear user data.
          <p>Not for use by third-party applications
          @hide
diff --git a/services/core/java/com/android/server/pm/PackageManagerService.java b/services/core/java/com/android/server/pm/PackageManagerService.java
index 07f74aaf201da..5f9a363dc7287 100644
--- a/services/core/java/com/android/server/pm/PackageManagerService.java
+++ b/services/core/java/com/android/server/pm/PackageManagerService.java
@@ -13934,43 +13934,6 @@ public class PackageManagerService extends IPackageManager.Stub
         return false;
     }
 
-    @Override
-    public boolean setSystemAppInstallState(String packageName, boolean installed, int userId) {
-        enforceSystemOrPhoneCaller("setSystemAppInstallState");
-        PackageSetting pkgSetting = mSettings.mPackages.get(packageName);
-        // The target app should always be in system
-        if (pkgSetting == null || !pkgSetting.isSystem()) {
-            return false;
-        }
-        // Check if the install state is the same
-        if (pkgSetting.getInstalled(userId) == installed) {
-            return false;
-        }
-
-        long callingId = Binder.clearCallingIdentity();
-        try {
-            if (installed) {
-                // install the app from uninstalled state
-                installExistingPackageAsUser(
-                        packageName,
-                        userId,
-                        0 /*installFlags*/,
-                        PackageManager.INSTALL_REASON_DEVICE_SETUP);
-                return true;
-            }
-
-            // uninstall the app from installed state
-            deletePackageVersioned(
-                    new VersionedPackage(packageName, PackageManager.VERSION_CODE_HIGHEST),
-                    new LegacyPackageDeleteObserver(null).getBinder(),
-                    userId,
-                    PackageManager.DELETE_SYSTEM_APP);
-            return true;
-        } finally {
-            Binder.restoreCallingIdentity(callingId);
-        }
-    }
-
     private void sendApplicationHiddenForUser(String packageName, PackageSetting pkgSetting,
             int userId) {
         final PackageRemovedInfo info = new PackageRemovedInfo(this);
@@ -14035,16 +13998,10 @@ public class PackageManagerService extends IPackageManager.Stub
     @Override
     public int installExistingPackageAsUser(String packageName, int userId, int installFlags,
             int installReason) {
-        final int callingUid = Binder.getCallingUid();
-        if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.INSTALL_PACKAGES)
-                != PackageManager.PERMISSION_GRANTED
-                && mContext.checkCallingOrSelfPermission(
-                        android.Manifest.permission.INSTALL_EXISTING_PACKAGES)
-                != PackageManager.PERMISSION_GRANTED) {
-            throw new SecurityException("Neither user " + callingUid + " nor current process has "
-                    + android.Manifest.permission.INSTALL_PACKAGES + ".");
-        }
+        mContext.enforceCallingOrSelfPermission(android.Manifest.permission.INSTALL_PACKAGES,
+                null);
         PackageSetting pkgSetting;
+        final int callingUid = Binder.getCallingUid();
         mPermissionManager.enforceCrossUserPermission(callingUid, userId,
                 true /* requireFullPermission */, true /* checkShell */,
                 "installExistingPackage for user " + userId);
diff --git a/telephony/java/com/android/internal/telephony/CarrierAppUtils.java b/telephony/java/com/android/internal/telephony/CarrierAppUtils.java
index 676684cdfbbd8..bcad554b579fb 100644
--- a/telephony/java/com/android/internal/telephony/CarrierAppUtils.java
+++ b/telephony/java/com/android/internal/telephony/CarrierAppUtils.java
@@ -152,14 +152,9 @@ public final class CarrierAppUtils {
                             && (ai.enabledSetting ==
                             PackageManager.COMPONENT_ENABLED_STATE_DEFAULT
                             || ai.enabledSetting ==
-                            PackageManager.COMPONENT_ENABLED_STATE_DISABLED_UNTIL_USED
-                            || (ai.flags & ApplicationInfo.FLAG_INSTALLED) == 0)) {
+                            PackageManager.COMPONENT_ENABLED_STATE_DISABLED_UNTIL_USED)) {
                         Slog.i(TAG, "Update state(" + packageName + "): ENABLED for user "
                                 + userId);
-                        packageManager.setSystemAppInstallState(
-                                packageName,
-                                true /*installed*/,
-                                userId);
                         packageManager.setApplicationEnabledSetting(
                                 packageName,
                                 PackageManager.COMPONENT_ENABLED_STATE_ENABLED,
@@ -175,14 +170,9 @@ public final class CarrierAppUtils {
                             if (associatedApp.enabledSetting ==
                                     PackageManager.COMPONENT_ENABLED_STATE_DEFAULT
                                     || associatedApp.enabledSetting ==
-                                    PackageManager.COMPONENT_ENABLED_STATE_DISABLED_UNTIL_USED
-                                    || (ai.flags & ApplicationInfo.FLAG_INSTALLED) == 0) {
+                                    PackageManager.COMPONENT_ENABLED_STATE_DISABLED_UNTIL_USED) {
                                 Slog.i(TAG, "Update associated state(" + associatedApp.packageName
                                         + "): ENABLED for user " + userId);
-                                packageManager.setSystemAppInstallState(
-                                        associatedApp.packageName,
-                                        true /*installed*/,
-                                        userId);
                                 packageManager.setApplicationEnabledSetting(
                                         associatedApp.packageName,
                                         PackageManager.COMPONENT_ENABLED_STATE_ENABLED,
@@ -200,14 +190,15 @@ public final class CarrierAppUtils {
                     // updated we shouldn't touch it.
                     if (!ai.isUpdatedSystemApp()
                             && ai.enabledSetting ==
-                            PackageManager.COMPONENT_ENABLED_STATE_DEFAULT
-                            && (ai.flags & ApplicationInfo.FLAG_INSTALLED) != 0) {
+                            PackageManager.COMPONENT_ENABLED_STATE_DEFAULT) {
                         Slog.i(TAG, "Update state(" + packageName
                                 + "): DISABLED_UNTIL_USED for user " + userId);
-                        packageManager.setSystemAppInstallState(
+                        packageManager.setApplicationEnabledSetting(
                                 packageName,
-                                false /*installed*/,
-                                userId);
+                                PackageManager.COMPONENT_ENABLED_STATE_DISABLED_UNTIL_USED,
+                                0,
+                                userId,
+                                callingPackage);
                     }
 
                     // Also disable any associated apps for this carrier app if this is the first
@@ -222,10 +213,13 @@ public final class CarrierAppUtils {
                                     Slog.i(TAG,
                                             "Update associated state(" + associatedApp.packageName
                                                     + "): DISABLED_UNTIL_USED for user " + userId);
-                                    packageManager.setSystemAppInstallState(
+                                    packageManager.setApplicationEnabledSetting(
                                             associatedApp.packageName,
-                                            false /*installed*/,
-                                            userId);
+                                            PackageManager
+                                                    .COMPONENT_ENABLED_STATE_DISABLED_UNTIL_USED,
+                                            0,
+                                            userId,
+                                            callingPackage);
                                 }
                             }
                         }
@@ -363,8 +357,7 @@ public final class CarrierAppUtils {
             String packageName) {
         try {
             ApplicationInfo ai = packageManager.getApplicationInfo(packageName,
-                    PackageManager.MATCH_DISABLED_UNTIL_USED_COMPONENTS
-                    | PackageManager.MATCH_HIDDEN_UNTIL_INSTALLED_COMPONENTS, userId);
+                    PackageManager.MATCH_DISABLED_UNTIL_USED_COMPONENTS, userId);
             if (ai != null && ai.isSystemApp()) {
                 return ai;
             }