diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d1d3ae8..0dc6b08 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -24,10 +24,10 @@ jobs:
       pip_cache_dir: ${{ steps.pip-cache.outputs.dir }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v4.1.7
+        uses: actions/checkout@v4.2.2
 
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v5.2.0
+        uses: actions/setup-python@v5.3.0
         with:
           python-version: ${{ matrix.python-version }}
 
@@ -60,10 +60,10 @@ jobs:
         python-version: [3.11, 3.12]
     steps:
       - name: Checkout
-        uses: actions/checkout@v4.1.7
+        uses: actions/checkout@v4.2.2
 
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v5.2.0
+        uses: actions/setup-python@v5.3.0
         with:
           python-version: ${{ matrix.python-version }}
 
@@ -92,7 +92,7 @@ jobs:
           pytest --cov=asusrouter --cov-report=xml:unit-tests-cov-${{ matrix.python-version }}.xml -k 'not test_devices'
 
       - name: Upload coverage to artifacts
-        uses: actions/upload-artifact@v4.4.0
+        uses: actions/upload-artifact@v4.4.3
         with:
           name: unit-tests-cov-${{ matrix.python-version }}
           path: unit-tests-cov-${{ matrix.python-version }}.xml
@@ -106,10 +106,10 @@ jobs:
         python-version: [3.11, 3.12]
     steps:
       - name: Checkout
-        uses: actions/checkout@v4.1.7
+        uses: actions/checkout@v4.2.2
 
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v5.2.0
+        uses: actions/setup-python@v5.3.0
         with:
           python-version: ${{ matrix.python-version }}
 
@@ -138,7 +138,7 @@ jobs:
           pytest --cov=asusrouter --cov-report=xml:real-data-tests-cov-${{ matrix.python-version }}.xml tests/test_devices.py --log-cli-level=INFO
 
       - name: Upload coverage to artifacts
-        uses: actions/upload-artifact@v4.4.0
+        uses: actions/upload-artifact@v4.4.3
         with:
           name: real-data-tests-cov-${{ matrix.python-version }}
           path: real-data-tests-cov-${{ matrix.python-version }}.xml
@@ -152,7 +152,7 @@ jobs:
         python-version: [3.11, 3.12]
     steps:
       - name: Checkout
-        uses: actions/checkout@v4.1.7
+        uses: actions/checkout@v4.2.2
 
       - name: Download unit-tests coverage from artifacts
         uses: actions/download-artifact@v4.1.8
@@ -167,7 +167,7 @@ jobs:
           path: .
 
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v4.5.0
+        uses: codecov/codecov-action@v4.6.0
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           fail_ci_if_error: true
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 21e7d9b..2f0315f 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -14,12 +14,12 @@ jobs:
 
     steps:
     - name: Checkout the repository
-      uses: actions/checkout@v4.1.7
+      uses: actions/checkout@v4.2.2
       with:
         ref: ${{ github.event.release.target_commitish }}
 
     - name: Setup Python ${{ env.DEFAULT_PYTHON }}
-      uses: actions/setup-python@v5.2.0
+      uses: actions/setup-python@v5.3.0
       with:
         python-version: ${{ env.DEFAULT_PYTHON }}
 
diff --git a/asusrouter/modules/firmware.py b/asusrouter/modules/firmware.py
index a18c6aa..2e96265 100644
--- a/asusrouter/modules/firmware.py
+++ b/asusrouter/modules/firmware.py
@@ -140,7 +140,11 @@ def from_string(self, fw_string: Optional[str] = None) -> None:
 
         fw_string = clean_string(fw_string)
         if not fw_string:
-            return
+            return None
+
+        # Special cases for old firmwares and absent data
+        if fw_string == "__":
+            return None
 
         pattern = (
             r"^(?P<major>[39].?0.?0.?[46])?[_.]?"
diff --git a/pyproject.toml b/pyproject.toml
index ad227f0..6ef8541 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name            = "asusrouter"
-version         = "1.13.0"
+version         = "1.13.1"
 license         = {text = "Apache-2.0"}
 requires-python = ">=3.11.0"
 readme          = "README.md"
diff --git a/tests/modules/test_firmware.py b/tests/modules/test_firmware.py
index b9d9ecb..06d93b2 100644
--- a/tests/modules/test_firmware.py
+++ b/tests/modules/test_firmware.py
@@ -161,6 +161,7 @@ def test_update_source(self, revision, expected_source):
             ),
             # Additional cases
             (".386.7_120", None, 386, 7, 120, False, False),
+            ("__", None, None, None, None, False, False),
             # Invalid input
             ("", None, None, None, None, False, False),
             ("invalid", None, None, None, None, False, False),