diff '--color=auto' -ur opencv-4.13.0.orig/cmake/OpenCVDetectFlatbuffers.cmake opencv-4.13.0/cmake/OpenCVDetectFlatbuffers.cmake
--- opencv-4.13.0.orig/cmake/OpenCVDetectFlatbuffers.cmake	2026-07-10 19:38:09.394157029 +0200
+++ opencv-4.13.0/cmake/OpenCVDetectFlatbuffers.cmake	2026-07-10 21:22:54.857422346 +0200
@@ -1,12 +1,6 @@
 if(WITH_FLATBUFFERS)
-  set(HAVE_FLATBUFFERS 1)
-  set(flatbuffers_VERSION "25.9.23")
-  ocv_install_3rdparty_licenses(flatbuffers "${OpenCV_SOURCE_DIR}/3rdparty/flatbuffers/LICENSE.txt")
-  ocv_add_external_target(flatbuffers "${OpenCV_SOURCE_DIR}/3rdparty/flatbuffers/include" "" "HAVE_FLATBUFFERS=1")
-  set(CUSTOM_STATUS_flatbuffers "    Flatbuffers:" "builtin/3rdparty (${flatbuffers_VERSION})")
-endif()
-
-if(WITH_FLATBUFFERS OR HAVE_FLATBUFFERS)
+  find_package(flatbuffers REQUIRED)
+  set(HAVE_FLATBUFFERS "${flatbuffers_FOUND}")
   list(APPEND CUSTOM_STATUS flatbuffers)
 
   if(HAVE_FLATBUFFERS)
diff '--color=auto' -ur opencv-4.13.0.orig/modules/dnn/misc/tflite/schema_generated.h opencv-4.13.0/modules/dnn/misc/tflite/schema_generated.h
--- opencv-4.13.0.orig/modules/dnn/misc/tflite/schema_generated.h	2025-12-30 08:52:05.000000000 +0100
+++ opencv-4.13.0/modules/dnn/misc/tflite/schema_generated.h	2026-07-10 21:24:42.280186712 +0200
@@ -9,8 +9,7 @@
 // Ensure the included flatbuffers.h is the same version as when this file was
 // generated, otherwise it may not be compatible.
 static_assert(FLATBUFFERS_VERSION_MAJOR == 25 &&
-              FLATBUFFERS_VERSION_MINOR == 9 &&
-              FLATBUFFERS_VERSION_REVISION == 23,
+              FLATBUFFERS_VERSION_MINOR >= 9,
              "Non-compatible flatbuffers version included");
 
 namespace opencv_tflite {