diff --git a/launch_chffrplus.sh b/launch_chffrplus.sh
index 7c78bea69..8844dd53d 100755
--- a/launch_chffrplus.sh
+++ b/launch_chffrplus.sh
@@ -155,6 +155,8 @@ from pathlib import Path
 import sys
 import time
 
+from openpilot.common.file_chunker import get_existing_chunks
+
 start = time.monotonic()
 last = start
 log_path = os.environ.get("SP_BOOT_TIMING_LOG")
@@ -193,12 +195,14 @@ for mod in mods:
   log_step(f"import:{mod}")
 
 repo_root = Path.cwd().parents[1]
-required_files = [
+required_model_artifacts = [
   repo_root / "selfdrive/modeld/models/driving_tinygrad.pkl",
   repo_root / "selfdrive/modeld/models/dmonitoring_model_metadata.pkl",
   repo_root / "selfdrive/modeld/models/dmonitoring_model_tinygrad.pkl",
   repo_root / "selfdrive/modeld/models/dm_warp_1928x1208_tinygrad.pkl",
   repo_root / "selfdrive/modeld/models/dm_warp_1344x760_tinygrad.pkl",
+]
+required_files = [
   repo_root / "selfdrive/pandad/pandad_api_impl.so",
   repo_root / "selfdrive/controls/lib/lateral_mpc_lib/c_generated_code/acados_ocp_solver_pyx.so",
   repo_root / "selfdrive/controls/lib/lateral_mpc_lib/c_generated_code/libacados_ocp_solver_lat.so",
@@ -207,6 +211,17 @@ required_files = [
   repo_root / "opendbc_repo/opendbc/dbc/gm_global_a_powertrain_generated.dbc",
 ]
 
+for path in required_model_artifacts:
+  try:
+    artifact_paths = [Path(p) for p in get_existing_chunks(path)]
+  except Exception as e:
+    raise FileNotFoundError(f"Missing prebuilt runtime artifact: {path}") from e
+  missing_chunks = [p for p in artifact_paths if not p.is_file()]
+  if missing_chunks:
+    missing = ", ".join(str(p) for p in missing_chunks)
+    raise FileNotFoundError(f"Missing prebuilt runtime artifact chunks for {path}: {missing}")
+log_step("required_model_artifacts")
+
 for path in required_files:
   if not path.is_file():
     raise FileNotFoundError(f"Missing prebuilt runtime artifact: {path}")
diff --git a/selfdrive/ui/layouts/settings/starpilot/driving_model.py b/selfdrive/ui/layouts/settings/starpilot/driving_model.py
index c50379575..2c8601b62 100644
--- a/selfdrive/ui/layouts/settings/starpilot/driving_model.py
+++ b/selfdrive/ui/layouts/settings/starpilot/driving_model.py
@@ -10,6 +10,7 @@ import time
 
 import pyray as rl
 
+from openpilot.common.file_chunker import get_chunk_name, get_manifest_path
 from openpilot.selfdrive.ui.ui_state import ui_state
 from openpilot.starpilot.assets.model_manager import (
   CANCEL_DOWNLOAD_PARAM,
@@ -844,6 +845,21 @@ class StarPilotDrivingModelLayout(_SettingsPage):
     except Exception:
       return set()
 
+  def _artifact_installed(self, filename: str, on_disk_files: set[str]) -> bool:
+    if filename in on_disk_files:
+      return True
+
+    manifest = get_manifest_path(filename)
+    if manifest not in on_disk_files:
+      return False
+
+    try:
+      num_chunks = int((self._model_dir / manifest).read_text().strip())
+    except Exception:
+      return False
+
+    return all(get_chunk_name(filename, idx, num_chunks) in on_disk_files for idx in range(num_chunks))
+
   def _is_model_installed(self, key: str, version: str = "", on_disk_files: set[str] | None = None) -> bool:
     model_key = canonical_model_key(str(key or "").strip())
     if not model_key:
@@ -853,7 +869,7 @@ class StarPilotDrivingModelLayout(_SettingsPage):
       return True
 
     files = on_disk_files if on_disk_files is not None else self._load_on_disk_files()
-    return f"{model_key}_driving_tinygrad.pkl" in files
+    return self._artifact_installed(f"{model_key}_driving_tinygrad.pkl", files)
 
   def _required_files_for_version(self, key: str, version: str) -> list[str]:
     del version
diff --git a/selfdrive/ui/mici/layouts/settings/driving_model.py b/selfdrive/ui/mici/layouts/settings/driving_model.py
index 4365c26ec..665fde49f 100644
--- a/selfdrive/ui/mici/layouts/settings/driving_model.py
+++ b/selfdrive/ui/mici/layouts/settings/driving_model.py
@@ -7,6 +7,7 @@ from dataclasses import dataclass
 from collections.abc import Callable
 from pathlib import Path
 
+from openpilot.common.file_chunker import get_chunk_name, get_manifest_path
 from openpilot.common.params import Params
 from openpilot.selfdrive.ui.mici.widgets.button import BigButton
 from openpilot.selfdrive.ui.mici.widgets.dialog import BigDialog, BigDialogBase, BigMultiOptionDialog
@@ -698,7 +699,23 @@ class DrivingModelBigButton(BigButton):
     if not required_files:
       return False
 
-    return all((MODELS_PATH / filename).is_file() for filename in required_files)
+    return all(self._artifact_installed(filename) for filename in required_files)
+
+  @staticmethod
+  def _artifact_installed(filename: str) -> bool:
+    if (MODELS_PATH / filename).is_file():
+      return True
+
+    manifest = get_manifest_path(filename)
+    if not (MODELS_PATH / manifest).is_file():
+      return False
+
+    try:
+      num_chunks = int((MODELS_PATH / manifest).read_text().strip())
+    except Exception:
+      return False
+
+    return all((MODELS_PATH / get_chunk_name(filename, idx, num_chunks)).is_file() for idx in range(num_chunks))
 
   def _is_builtin_default_model(self, key: str) -> bool:
     default_key = self._params.get_default_value("DrivingModel") or self._params.get_default_value("Model")