diff --git a/emulators/openbor.yml b/emulators/openbor.yml
index 53226b81..8b1d6d01 100644
--- a/emulators/openbor.yml
+++ b/emulators/openbor.yml
@@ -4,7 +4,7 @@ core_classification: game_engine
 source: "https://github.com/DCurrent/openbor"
 upstream: "https://github.com/DCurrent/openbor"
 profiled_date: "2026-08-12"
-source_commit: "0ece95d1c113c1ce86f2da826b3c25b521ee116d"
+source_commit: "9d81480f8481fbb9e76b0b5f2a5dfa408376761a"
 core_version: "4.0 Build 7949"
 display_name: "OpenBOR Game Engine"
 cores:
@@ -35,18 +35,18 @@ notes: |
   such argument the built in menu lists Paks/ and the player picks one
   (engine/sdl/sdlport.c:25,124-135, engine/sdl/menu.c:172-203,802).
   packfile_supported accepts any name containing .pak and skips menu.pak
-  (engine/source/gamelib/packfile.c:1577-1584).
+  (engine/source/gamelib/packfile.c:1595-1602).
 
   Everything read for a running game comes out of that module. buffer_pakfile
   tries the real filesystem first through fopen, then the same path inside the
-  archive (engine/openbor.c:921-965,969-1018), so data/models.txt,
+  archive (engine/openbor.c:935-979,983-1032), so data/models.txt,
   data/levels.txt, data/video.txt, data/menu.txt, the scene scripts and the
   sprites and sounds under data/ resolve either from an unpacked data/ directory
   beside the binary (engine/source/gamelib/packfile.c:781-810) or from the pak.
   Four names take precedence over their in-pak copy when they exist on disk:
   translation/translation.txt and translation/menu.txt over data/translation.txt
-  (engine/source/gamelib/translation.c:102-106, engine/openbor.c:5975,53240),
-  saves/lifebar.txt over data/lifebar.txt (engine/openbor.c:4965-4972), and on
+  (engine/source/gamelib/translation.c:102-106, engine/openbor.c:6744,54707),
+  saves/lifebar.txt over data/lifebar.txt (engine/openbor.c:5734-5741), and on
   Android Saves/<module>/touch.txt then Saves/touch.txt over data/touch.txt
   (engine/android/app/jni/openbor/video.c:210-218). Each holds text or a control
   layout written for one module. The engine/translation.txt copied into the
@@ -67,12 +67,12 @@ notes: |
   Files the engine writes rather than expects: Paks, Saves, Logs and ScreenShots
   are created at startup when missing (engine/sdl/sdlport.c:30-33,119-122),
   settings and progress land in Saves as <module>.cfg, .sav, .hi, .scr and .inp
-  alongside default.cfg (engine/source/utils.c:284-312,
-  engine/openbor.c:2675-3040), and the viewer reads back Logs/OpenBorLog.txt and
+  alongside default.cfg (engine/source/utils.c:324-352,
+  engine/openbor.c:2940-3482), and the viewer reads back Logs/OpenBorLog.txt and
   Logs/ScriptLog.txt (engine/source/utils.c:47-62, engine/sdl/menu.c:652-700).
   paks/logoff.txt is a marker whose existence alone skips the startup logo, so
   the player creates it empty (engine/sdl/menu.c:707-716). Module script can
   open any path it names through openfilestream
-  (engine/openborscript.c:10505-10600).
+  (engine/openborscript.c:10573-10668).
 
 files: []
diff --git a/scripts/profile_sync.py b/scripts/profile_sync.py
index 2b029f00..b427e170 100644
--- a/scripts/profile_sync.py
+++ b/scripts/profile_sync.py
@@ -45,7 +45,12 @@ WIDEN_STEPS = (0, 3, 6, 12, 25, 50)
 # A 30k-line driver diffs in about five seconds, and the biggest files the
 # corpus cites sit just above that. The cap stays as a guard against
 # pathological inputs, not as a limit on real source files.
-MAX_MATCH_LINES = 40000
+# The fallback mapping is a full sequence diff, and it only runs once exact
+# anchoring has failed, which is rare. openbor.c is the largest file any
+# profile cites, 55k lines against 57k, and diffing the pair takes nine
+# seconds; the ceiling sits above it so that one resolves, and still stops a
+# pathological pair from stalling a sweep of every profile.
+MAX_MATCH_LINES = 60000
 
 PIN = "pin"
 HEAD = "head"
diff --git a/tests/test_profile_sync.py b/tests/test_profile_sync.py
index 659af9e3..9ed005f9 100644
--- a/tests/test_profile_sync.py
+++ b/tests/test_profile_sync.py
@@ -2160,6 +2160,34 @@ class TestWriteDryRun(unittest.TestCase):
         self.assertEqual(self.path.read_text(), before)
 
 
+class TestLargeFileCeiling(unittest.TestCase):
+    """The fallback mapping bails above a ceiling, and it sits high enough.
+
+    openbor.c is the largest file any profile cites, 55k lines against 57k
+    at HEAD, and the ref that mattered mapped only once the ceiling cleared
+    it. The guard stays so a pathological pair cannot stall a sweep.
+    """
+
+    def test_a_pair_over_the_ceiling_is_not_diffed(self):
+        big = ["x"] * (profile_sync.MAX_MATCH_LINES + 1)
+        result = profile_sync._map_changed(big, big, 1, 2)
+        self.assertEqual(result.status, "CHANGED")
+        self.assertIn("over", result.reason)
+
+    def test_a_pair_under_the_ceiling_is_mapped(self):
+        pin = ["a", "subject", "b"]
+        head = ["pad", "pad", "a", "subject", "b"]
+        result = profile_sync._map_changed(pin, head, 2, 2)
+        self.assertIsNotNone(result.start, "a small pair has to be diffed")
+        self.assertNotIn("over", result.reason or "")
+
+    def test_the_ceiling_clears_the_largest_file_any_profile_cites(self):
+        self.assertGreater(
+            profile_sync.MAX_MATCH_LINES, 57000,
+            "openbor.c is 57k lines at HEAD and its ref has to map",
+        )
+
+
 class TestRebaseWaitsForThePin(unittest.TestCase):
     """Recaling refs the pin cannot follow manufactures the desync.