diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ba74c00..06c6f36 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -6,15 +6,37 @@ on:
     tags:
       - '*'
     branches:
-      - master
+      - mru-toto
   pull_request:
     branches:
       - master
 
 jobs:
+  build_install:
+    name: Build and install the Ledgerblue Python package
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python_version: ['3.8', '3.9', '3.10', '3.11', '3.12', '3.13']
+    steps:
+    - name: Clone
+      uses: actions/checkout@v4
+
+    - name: Setup Python version
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python_version }}
+
+    - name: Build & install
+      run: |
+        pip install -U pip
+        pip install -U .
+
   package-deploy:
     name: Build the Python package, and deploy if needed
     runs-on: ubuntu-latest
+    needs: build_install
     steps:
     - name: Clone
       uses: actions/checkout@v3
@@ -23,6 +45,10 @@ jobs:
 
     - name: Install dependencies
       run: |
+        # Needed to workaround this bug https://github.com/pypa/setuptools/issues/4759
+        # To be removed when it's fixed
+        pip install -U packaging
+
         python -m pip install pip --upgrade
         pip install build twine
 
diff --git a/ledgerblue/hexLoader.py b/ledgerblue/hexLoader.py
index 206bcd9..4265a65 100644
--- a/ledgerblue/hexLoader.py
+++ b/ledgerblue/hexLoader.py
@@ -568,14 +568,14 @@ def load(self, erase_u8, max_length_per_apdu, hexFile, reverse=False, doCRC=True
 				if reverse:
 					chunk = data[offset-chunkLen : offset]
 					if self.createpackParams:
-						self.loadPackSegmentChunk(offset-chunkLen, bytes(chunk))
+						self.loadPackSegmentChunk(startAddress+offset-chunkLen, bytes(chunk))
 					else:
 						self.loadSegmentChunk(offset-chunkLen, bytes(chunk))
 				else:
 					chunk = data[offset : offset + chunkLen]
 					sha256.update(chunk)
 					if self.createpackParams:
-						self.loadPackSegmentChunk(offset, bytes(chunk))
+						self.loadPackSegmentChunk(startAddress+offset, bytes(chunk))
 					else:
 						self.loadSegmentChunk(offset, bytes(chunk))
 				if reverse:
diff --git a/pyproject.toml b/pyproject.toml
index 3b8bd44..66d8b7b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [build-system]
 requires = [
-    "setuptools>=45",
+    "setuptools>=75",
     "setuptools_scm[toml]>=6.2",
     "wheel"
 ]
@@ -21,18 +21,19 @@ classifiers = [
     "Operating System :: MacOS :: MacOS X",
     "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3 :: Only",
-    "Programming Language :: Python :: 3.6",
-    "Programming Language :: Python :: 3.7",
     "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
 ]
 dynamic = [ "version" ]
-requires-python = ">=3"
+requires-python = ">=3.8"
 dependencies = [
     "pyelftools>=0.29,<1.0",
     "hidapi>=0.7.99",
-    "protobuf >=3.20,<4",
+    "protobuf >=5",
     "pycryptodomex>=3.6.1",
     "future",
     "ecpy>=0.9.0",