diff --git a/app/brave_generated_resources.grd b/app/brave_generated_resources.grd
index ff5d920dee658..cc3e3f2ccfd97 100644
--- a/app/brave_generated_resources.grd
+++ b/app/brave_generated_resources.grd
@@ -595,6 +595,10 @@ Or change later at <ph name="SETTINGS_EXTENIONS_LINK">$2<ex>brave://settings/ext
         <message name="IDS_WEB_DISCOVERY_INFOBAR_NO_THANKS_LABEL" desc="The text for no thanks button in infobar">
           No thanks
         </message>
+        <!-- obsolete system InfoBar -->
+        <message name="IDS_OBSOLERE_SYSTEM_INFOBAR_DONT_SHOW_BUTTON" desc="The text for don't show again button">
+          Don't show again
+        </message>
       </if>
 
       <!-- Brave Ads -->
diff --git a/browser/ui/BUILD.gn b/browser/ui/BUILD.gn
index e322011416a0d..a8934be66b693 100644
--- a/browser/ui/BUILD.gn
+++ b/browser/ui/BUILD.gn
@@ -1,3 +1,8 @@
+# Copyright (c) 2022 The Brave Authors. All rights reserved.
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at https://mozilla.org/MPL/2.0/.
+
 import("//brave/browser/ethereum_remote_client/buildflags/buildflags.gni")
 import("//brave/browser/shell_integrations/buildflags/buildflags.gni")
 import("//brave/build/config.gni")
@@ -95,6 +100,8 @@ source_set("ui") {
       "omnibox/brave_omnibox_client_impl.cc",
       "omnibox/brave_omnibox_client_impl.h",
       "session_crashed_bubble_brave.cc",
+      "startup/brave_obsolete_system_infobar_delegate.cc",
+      "startup/brave_obsolete_system_infobar_delegate.h",
       "toolbar/brave_app_menu_model.cc",
       "toolbar/brave_app_menu_model.h",
       "toolbar/brave_recent_tabs_sub_menu_model.h",
diff --git a/browser/ui/startup/brave_obsolete_system_infobar_delegate.cc b/browser/ui/startup/brave_obsolete_system_infobar_delegate.cc
new file mode 100644
index 0000000000000..bb32b6201dbc5
--- /dev/null
+++ b/browser/ui/startup/brave_obsolete_system_infobar_delegate.cc
@@ -0,0 +1,46 @@
+/* Copyright (c) 2022 The Brave Authors. All rights reserved.
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+#include <memory>
+
+#include "brave/browser/ui/startup/brave_obsolete_system_infobar_delegate.h"
+#include "brave/grit/brave_generated_resources.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/infobars/confirm_infobar_creator.h"
+#include "chrome/common/pref_names.h"
+#include "components/infobars/content/content_infobar_manager.h"
+#include "components/infobars/core/infobar.h"
+#include "components/prefs/pref_service.h"
+#include "ui/base/l10n/l10n_util.h"
+
+// static
+void BraveObsoleteSystemInfoBarDelegate::Create(
+    infobars::ContentInfoBarManager* infobar_manager) {
+  infobar_manager->AddInfoBar(
+      CreateConfirmInfoBar(std::unique_ptr<ConfirmInfoBarDelegate>(
+          new BraveObsoleteSystemInfoBarDelegate())));
+}
+
+BraveObsoleteSystemInfoBarDelegate::BraveObsoleteSystemInfoBarDelegate() =
+    default;
+BraveObsoleteSystemInfoBarDelegate::~BraveObsoleteSystemInfoBarDelegate() =
+    default;
+
+int BraveObsoleteSystemInfoBarDelegate::GetButtons() const {
+  return BUTTON_OK;
+}
+
+std::u16string BraveObsoleteSystemInfoBarDelegate::GetButtonLabel(
+    InfoBarButton button) const {
+  return l10n_util::GetStringUTF16(
+      IDS_OBSOLERE_SYSTEM_INFOBAR_DONT_SHOW_BUTTON);
+}
+
+bool BraveObsoleteSystemInfoBarDelegate::Accept() {
+  if (PrefService* local_state = g_browser_process->local_state()) {
+    local_state->SetBoolean(prefs::kSuppressUnsupportedOSWarning, true);
+  }
+  return true;
+}
diff --git a/browser/ui/startup/brave_obsolete_system_infobar_delegate.h b/browser/ui/startup/brave_obsolete_system_infobar_delegate.h
new file mode 100644
index 0000000000000..d30854e501c0c
--- /dev/null
+++ b/browser/ui/startup/brave_obsolete_system_infobar_delegate.h
@@ -0,0 +1,39 @@
+/* Copyright (c) 2022 The Brave Authors. All rights reserved.
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+#ifndef BRAVE_BROWSER_UI_STARTUP_BRAVE_OBSOLETE_SYSTEM_INFOBAR_DELEGATE_H_
+#define BRAVE_BROWSER_UI_STARTUP_BRAVE_OBSOLETE_SYSTEM_INFOBAR_DELEGATE_H_
+
+#include <string>
+
+#include "chrome/browser/ui/startup/obsolete_system_infobar_delegate.h"
+
+namespace infobars {
+class ContentInfoBarManager;
+}  // namespace infobars
+
+// Subclassed for showing "Don't show again" button.
+// W/o this button, user will see this infobar whenever launched.
+class BraveObsoleteSystemInfoBarDelegate
+    : public ObsoleteSystemInfoBarDelegate {
+ public:
+  static void Create(infobars::ContentInfoBarManager* infobar_manager);
+
+  BraveObsoleteSystemInfoBarDelegate(
+      const BraveObsoleteSystemInfoBarDelegate&) = delete;
+  BraveObsoleteSystemInfoBarDelegate& operator=(
+      const BraveObsoleteSystemInfoBarDelegate&) = delete;
+
+ private:
+  BraveObsoleteSystemInfoBarDelegate();
+  ~BraveObsoleteSystemInfoBarDelegate() override;
+
+  // ObsoleteSystemInfoBarDelegate overrides:
+  int GetButtons() const override;
+  std::u16string GetButtonLabel(InfoBarButton button) const override;
+  bool Accept() override;
+};
+
+#endif  // BRAVE_BROWSER_UI_STARTUP_BRAVE_OBSOLETE_SYSTEM_INFOBAR_DELEGATE_H_
diff --git a/chromium_src/chrome/browser/ui/startup/infobar_utils.cc b/chromium_src/chrome/browser/ui/startup/infobar_utils.cc
index c875c90c97772..c584171fe1f18 100644
--- a/chromium_src/chrome/browser/ui/startup/infobar_utils.cc
+++ b/chromium_src/chrome/browser/ui/startup/infobar_utils.cc
@@ -1,8 +1,9 @@
 /* Copyright (c) 2021 The Brave Authors. All rights reserved.
  * This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
+ * You can obtain one at https://mozilla.org/MPL/2.0/. */
 
+#include "brave/browser/ui/startup/brave_obsolete_system_infobar_delegate.h"
 #include "chrome/browser/ui/session_crashed_bubble.h"
 #include "chrome/browser/ui/startup/google_api_keys_infobar_delegate.h"
 #include "components/infobars/content/content_infobar_manager.h"
@@ -16,7 +17,10 @@ class BraveGoogleKeysInfoBarDelegate {
 
 #define ShowIfNotOffTheRecordProfile ShowIfNotOffTheRecordProfileBrave
 #define GoogleApiKeysInfoBarDelegate BraveGoogleKeysInfoBarDelegate
+#define ObsoleteSystemInfoBarDelegate BraveObsoleteSystemInfoBarDelegate
 
 #include "src/chrome/browser/ui/startup/infobar_utils.cc"
+
+#undef ObsoleteSystemInfoBarDelegate
 #undef GoogleApiKeysInfoBarDelegate
 #undef ShowIfNotOffTheRecordProfile
diff --git a/chromium_src/chrome/browser/ui/startup/obsolete_system_infobar_delegate.h b/chromium_src/chrome/browser/ui/startup/obsolete_system_infobar_delegate.h
new file mode 100644
index 0000000000000..17d76010bfeb5
--- /dev/null
+++ b/chromium_src/chrome/browser/ui/startup/obsolete_system_infobar_delegate.h
@@ -0,0 +1,20 @@
+/* Copyright (c) 2022 The Brave Authors. All rights reserved.
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+#ifndef BRAVE_CHROMIUM_SRC_CHROME_BROWSER_UI_STARTUP_OBSOLETE_SYSTEM_INFOBAR_DELEGATE_H_
+#define BRAVE_CHROMIUM_SRC_CHROME_BROWSER_UI_STARTUP_OBSOLETE_SYSTEM_INFOBAR_DELEGATE_H_
+
+#include "components/infobars/core/confirm_infobar_delegate.h"
+
+#define Create                                     \
+  Create_UnUsed() {}                               \
+  friend class BraveObsoleteSystemInfoBarDelegate; \
+  static void Create
+
+#include "src/chrome/browser/ui/startup/obsolete_system_infobar_delegate.h"
+
+#undef Create
+
+#endif  // BRAVE_CHROMIUM_SRC_CHROME_BROWSER_UI_STARTUP_OBSOLETE_SYSTEM_INFOBAR_DELEGATE_H_