diff --git a/.github/workflows/pull.yml b/.github/workflows/pull.yml
index c9dd6a0b734..30666e13006 100644
--- a/.github/workflows/pull.yml
+++ b/.github/workflows/pull.yml
@@ -13,32 +13,32 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
-  # test-qnn-wheel-packages-linux:
-  #   name: test-qnn-wheel-packages-linux
-  #   uses: pytorch/test-infra/.github/workflows/linux_job_v2.yml@main
-  #   permissions:
-  #     id-token: write
-  #     contents: read
-  #   strategy:
-  #     fail-fast: false
-  #     matrix:
-  #       python-version: [ "3.10", "3.11", "3.12" ]
-  #   with:
-  #     runner: linux.2xlarge
-  #     docker-image: ci-image:executorch-ubuntu-22.04-qnn-sdk
-  #     submodules: 'recursive'
-  #     ref: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.sha || github.sha }}
-  #     timeout: 180
-  #     script: |
-  #       # The generic Linux job chooses to use base env, not the one setup by the image
-  #       CONDA_ENV=$(conda env list --json | jq -r ".envs | .[-1]")
-  #       conda activate "${CONDA_ENV}"
+  test-qnn-wheel-packages-linux:
+    name: test-qnn-wheel-packages-linux
+    uses: pytorch/test-infra/.github/workflows/linux_job_v2.yml@main
+    permissions:
+      id-token: write
+      contents: read
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: [ "3.10", "3.11", "3.12" ]
+    with:
+      runner: linux.2xlarge
+      docker-image: ci-image:executorch-ubuntu-22.04-qnn-sdk
+      submodules: 'recursive'
+      ref: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.sha || github.sha }}
+      timeout: 180
+      script: |
+        # The generic Linux job chooses to use base env, not the one setup by the image
+        CONDA_ENV=$(conda env list --json | jq -r ".envs | .[-1]")
+        conda activate "${CONDA_ENV}"
 
-  #       # Create a clean env for each python version
-  #       conda create -y -n test_env_${{ matrix.python-version }} python=${{ matrix.python-version }}
-  #       conda activate test_env_${{ matrix.python-version }}
+        # Create a clean env for each python version
+        conda create -y -n test_env_${{ matrix.python-version }} python=${{ matrix.python-version }}
+        conda activate test_env_${{ matrix.python-version }}
 
-  #       PYTHON_EXECUTABLE=python bash .ci/scripts/test_wheel_package_qnn.sh "${{ matrix.python-version }}"
+        PYTHON_EXECUTABLE=python bash .ci/scripts/test_wheel_package_qnn.sh "${{ matrix.python-version }}"
 
   test-setup-linux-gcc:
     name: test-setup-linux-gcc
diff --git a/backends/qualcomm/scripts/download_qnn_sdk.py b/backends/qualcomm/scripts/download_qnn_sdk.py
index 5524adf8988..ec223cb273b 100644
--- a/backends/qualcomm/scripts/download_qnn_sdk.py
+++ b/backends/qualcomm/scripts/download_qnn_sdk.py
@@ -117,7 +117,7 @@ def _atomic_download(url: str, dest: pathlib.Path):
 
 
 def _download_archive(url: str, archive_path: pathlib.Path) -> bool:
-    """Robust streaming download with retries."""
+    """Streaming download with retry + resume support."""
 
     logger.debug("Archive will be saved to: %s", archive_path)
 
@@ -130,32 +130,80 @@ def _download_archive(url: str, archive_path: pathlib.Path) -> bool:
     )
     session.mount("https://", HTTPAdapter(max_retries=retries))
 
+    # ------------------------------------------------------------
+    # 1. Detect total file size (HEAD is broken on Qualcomm)
+    # ------------------------------------------------------------
     try:
-        with session.get(url, stream=True) as r:
+        # NOTE:
+        # Qualcomm's download endpoint does not return accurate metadata on HEAD requests.
+        # Many Qualcomm URLs first redirect to an HTML "wrapper" page (typically ~134 bytes),
+        # and the HEAD request reflects *that wrapper* rather than the actual ZIP archive.
+        #
+        # Example:
+        #   HEAD -> Content-Length: 134, Content-Type: text/html
+        #   GET  -> Content-Length: 1354151797, Content-Type: application/zip
+        #
+        # Because Content-Length from HEAD is frequently incorrect, we fall back to issuing
+        # a GET request with stream=True to obtain the real Content-Length without downloading
+        # the full file. This ensures correct resume logic and size validation.
+        r_head = session.get(url, stream=True)
+        r_head.raise_for_status()
+
+        if "content-length" not in r_head.headers:
+            logger.error("Server did not return content-length!")
+            return False
+
+        total_size = int(r_head.headers["content-length"])
+    except Exception as e:
+        logger.exception("Failed to determine file size: %s", e)
+        return False
+
+    # ------------------------------------------------------------
+    # 2. If partial file exists, resume
+    # ------------------------------------------------------------
+    downloaded = archive_path.stat().st_size if archive_path.exists() else 0
+    if downloaded > total_size:
+        logger.warning("Existing file is larger than expected. Removing.")
+        archive_path.unlink()
+        downloaded = 0
+
+    logger.info("Resuming download from %d / %d bytes", downloaded, total_size)
+
+    headers = {}
+    if downloaded > 0:
+        headers["Range"] = f"bytes={downloaded}-"
+
+    try:
+        # resume GET
+        with session.get(url, stream=True, headers=headers) as r:
             r.raise_for_status()
 
-            downloaded = 0
             chunk_size = 1024 * 1024  # 1MB
+            mode = "ab" if downloaded > 0 else "wb"
 
-            with open(archive_path, "wb") as f:
+            with open(archive_path, mode) as f:
                 for chunk in r.iter_content(chunk_size):
                     if chunk:
                         f.write(chunk)
                         downloaded += len(chunk)
 
-        logger.info("Download completed!")
-
     except Exception as e:
         logger.exception("Error during download: %s", e)
         return False
 
-    if archive_path.exists() and archive_path.stat().st_size == 0:
-        logger.warning("Downloaded file is empty!")
-        return False
-    elif not archive_path.exists():
-        logger.error("File was not downloaded!")
+    # ------------------------------------------------------------
+    # 3. Validate final size
+    # ------------------------------------------------------------
+    final_size = archive_path.stat().st_size
+    if final_size != total_size:
+        logger.error(
+            "Download incomplete: expected %d, got %d",
+            total_size,
+            final_size,
+        )
         return False
 
+    logger.info("Download completed successfully!")
     return True
 
 
diff --git a/tools/cmake/preset/pybind.cmake b/tools/cmake/preset/pybind.cmake
index 699a7c50358..a0d06d74d17 100644
--- a/tools/cmake/preset/pybind.cmake
+++ b/tools/cmake/preset/pybind.cmake
@@ -37,7 +37,7 @@ elseif(CMAKE_SYSTEM_NAME STREQUAL "Linux")
   set_overridable_option(EXECUTORCH_BUILD_EXTENSION_LLM_RUNNER ON)
   set_overridable_option(EXECUTORCH_BUILD_EXTENSION_LLM ON)
   if(CMAKE_SYSTEM_PROCESSOR MATCHES "^(x86_64|amd64|i.86)$")
-    set_overridable_option(EXECUTORCH_BUILD_QNN OFF)
+    set_overridable_option(EXECUTORCH_BUILD_QNN ON)
   endif()
 elseif(CMAKE_SYSTEM_NAME STREQUAL "Windows" OR CMAKE_SYSTEM_NAME STREQUAL
                                                "WIN32"