diff --git a/comfy/app/frontend_management.py b/comfy/app/frontend_management.py
index b9ae52752..a8bf14257 100644
--- a/comfy/app/frontend_management.py
+++ b/comfy/app/frontend_management.py
@@ -20,6 +20,8 @@ from ..cmd.folder_paths import add_model_folder_path  # pylint: disable=import-e
 
 REQUEST_TIMEOUT = 10  # seconds
 
+def check_frontend_version():
+    return None
 
 class Asset(TypedDict):
     url: str
@@ -162,7 +164,7 @@ class FrontendManager:
             main error source might be request timeout or invalid URL.
         """
         if version_string == DEFAULT_VERSION_STRING:
-            # check_frontend_version()
+            check_frontend_version()
             return cls.default_frontend_path()
 
         repo_owner, repo_name, version = cls.parse_version_string(version_string)
@@ -224,5 +226,5 @@ class FrontendManager:
         except Exception as e:
             logging.error("Failed to initialize frontend: %s", e)
             logging.info("Falling back to the default frontend.")
-            # check_frontend_version()
+            check_frontend_version()
             return cls.default_frontend_path()
diff --git a/comfy/ldm/hunyuan3d/model.py b/comfy/ldm/hunyuan3d/model.py
index 4e18358f0..39d049309 100644
--- a/comfy/ldm/hunyuan3d/model.py
+++ b/comfy/ldm/hunyuan3d/model.py
@@ -85,7 +85,7 @@ class Hunyuan3Dv2(nn.Module):
         blocks_replace = patches_replace.get("dit", {})
         for i, block in enumerate(self.double_blocks):
             if ("double_block", i) in blocks_replace:
-                def block_wrap(args):
+                def block_wrap1(args):
                     out = {}
                     out["img"], out["txt"] = block(img=args["img"],
                                                    txt=args["txt"],
@@ -99,7 +99,7 @@ class Hunyuan3Dv2(nn.Module):
                                                            "vec": vec,
                                                            "pe": pe,
                                                            "attn_mask": attn_mask},
-                                                          {"original_block": block_wrap})
+                                                          {"original_block": block_wrap1})
                 txt = out["txt"]
                 img = out["img"]
             else:
diff --git a/comfy/ldm/modules/attention.py b/comfy/ldm/modules/attention.py
index 57fdc72c2..30e6c528e 100644
--- a/comfy/ldm/modules/attention.py
+++ b/comfy/ldm/modules/attention.py
@@ -22,11 +22,9 @@ else:
     sageattn = torch.nn.functional.scaled_dot_product_attention
 
 if model_management.flash_attention_enabled():
-    try:
-        from flash_attn import flash_attn_func
-    except ModuleNotFoundError:
-        logging.error(f"\n\nTo use the `--use-flash-attention` feature, the `flash-attn` package must be installed first.\ncommand:\n\t{sys.executable} -m pip install flash-attn")
-        exit(-1)
+    from flash_attn import flash_attn_func  # pylint: disable=import-error
+else:
+    flash_attn_func = torch.nn.functional.scaled_dot_product_attention
 
 from ...cli_args import args
 from ... import ops
@@ -546,7 +544,7 @@ try:
     @torch.library.custom_op("flash_attention::flash_attn", mutates_args=())
     def flash_attn_wrapper(q: torch.Tensor, k: torch.Tensor, v: torch.Tensor,
                     dropout_p: float = 0.0, causal: bool = False) -> torch.Tensor:
-        return flash_attn_func(q, k, v, dropout_p=dropout_p, causal=causal)
+        return flash_attn_func(q, k, v, dropout_p=dropout_p, causal=causal)  # pylint: disable=possibly-used-before-assignment,used-before-assignment
 
 
     @flash_attn_wrapper.register_fake
diff --git a/comfy/model_base.py b/comfy/model_base.py
index 400ab33b7..c0ec921f8 100644
--- a/comfy/model_base.py
+++ b/comfy/model_base.py
@@ -40,7 +40,7 @@ from .ldm.hunyuan_video.model import HunyuanVideo as HunyuanVideoModel
 from .ldm.hydit.models import HunYuanDiT
 from .ldm.lightricks.model import LTXVModel
 from .ldm.lumina.model import NextDiT
-from .ldm.hunyuan3d.model import Hunyuan3Dv2
+from .ldm.hunyuan3d.model import Hunyuan3Dv2 as Hunyuan3Dv2Model
 from .ldm.modules.diffusionmodules.mmdit import OpenAISignatureMMDITWrapper
 from .ldm.modules.diffusionmodules.openaimodel import UNetModel, Timestep
 from .ldm.modules.diffusionmodules.upscaling import ImageConcatWithNoiseAugmentation
@@ -64,7 +64,7 @@ class ModelType(Enum):
     IMG_TO_IMG = 9
 
 
-from .model_sampling import EPS, V_PREDICTION, EDM, ModelSamplingDiscrete, ModelSamplingContinuousEDM, StableCascadeSampling, CONST, ModelSamplingDiscreteFlow, ModelSamplingContinuousV, ModelSamplingFlux
+from .model_sampling import EPS, V_PREDICTION, EDM, ModelSamplingDiscrete, ModelSamplingContinuousEDM, StableCascadeSampling, CONST, ModelSamplingDiscreteFlow, ModelSamplingContinuousV, ModelSamplingFlux, IMG_TO_IMG
 
 
 def model_sampling(model_config, model_type):
@@ -94,7 +94,7 @@ def model_sampling(model_config, model_type):
         c = CONST
         s = ModelSamplingFlux
     elif model_type == ModelType.IMG_TO_IMG:
-        c = model_sampling.IMG_TO_IMG
+        c = IMG_TO_IMG
 
     class ModelSampling(s, c):
         pass
@@ -1081,7 +1081,7 @@ class WAN21(BaseModel):
 
 class Hunyuan3Dv2(BaseModel):
     def __init__(self, model_config, model_type=ModelType.FLOW, device=None):
-        super().__init__(model_config, model_type, device=device, unet_model=Hunyuan3Dv2)
+        super().__init__(model_config, model_type, device=device, unet_model=Hunyuan3Dv2Model)
 
     def extra_conds(self, **kwargs):
         out = super().extra_conds(**kwargs)
diff --git a/comfy/model_management.py b/comfy/model_management.py
index 66d4e0551..147f5ea88 100644
--- a/comfy/model_management.py
+++ b/comfy/model_management.py
@@ -1103,7 +1103,7 @@ def flash_attn_enabled():
         return False
     if directml_device:
         return False
-    return FLASH_ATTENTION_ENABLED
+    return flash_attention_enabled()
 
 
 def xformers_enabled_vae():