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+# Trezor
+
+## Messages rebuild
+
+Install `protoc` for your distribution.
+
+- `protobuf-compiler`
+- `libprotobuf-dev`
+- `libprotoc-dev`
+- `python-protobuf`
+
+Python 3 is required. If you don't have python 3 quite an easy way is
+to use [pyenv].
+
+It is also advised to create own python virtual environment so dependencies
+are installed in this project-related virtual environment.
+
+```bash
+python -m venv /
+```
+
+Make sure your python has `protobuf` package installed
+
+```bash
+pip install protobuf
+```
+
+Regenerate messages:
+
+```
+./venv/bin/python3 src/device_trezor/trezor/tools/build_protob.py
+```
+
+The messages regeneration is done also automatically via cmake.
+
+[pyenv]: https://github.com/pyenv/pyenv