update README.md

README.md

@@ -116,6 +116,33 @@ pip install -e ".[gui,crypto]"
 python run_electrum
 ```
 
+##### Note for ARM64
+
+On ARM64, PyQt6 6.9+ wheels are not available on PyPI. Install with pinned versions:
+
+```bash
+# Create and activate virtual environment
+python3 -m venv env
+source env/bin/activate
+
+# Upgrade pip and install dependencies
+python3 -m pip install --upgrade pip
+pip install -r contrib/requirements/requirements.txt
+pip install cryptography>=2.6
+
+# Install PyQt6 (ARM64-compatible versions)
+pip install --only-binary PyQt6,PyQt6-Qt6 \
+    'PyQt6>=6.7.0,<6.8.0' \
+    'PyQt6-Qt6>=6.7.0,<6.8.0' \
+    'PyQt6-sip==13.10.2'
+
+# Install in development mode (without gui extra)
+pip install -e .
+
+# Run
+python3 run_electrum
+```
+
 ##### Optional: QML GUI on Linux (simulates Android interface)
 
 ```bash