# OpenNord: reconstructing Nord Stage file and USB transfer formats

> OpenNord reconstructs Nord Stage program handling and USB transfer in a keyboard companion app. It reads Stage 2, 3 and 4 program files through a shared CBIN container and model codecs, and uses a recovered vendor bulk USB protocol to enumerate devices and transfer programs. Sample readers and a local library support inspection and playback.

- Type: Case study
- Targets: Protocol
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-08
- Added to the catalog: 2026-11-08
- Original resource: <https://github.com/simonflore/opennord>
- Primary source: <https://github.com/simonflore/opennord/blob/19b5f59d4511f5a66ebaae86e0c8cfa29f5a68a3/README.md>
- Catalog page: <https://awesomerea.org/resources/opennord-case/>
- Record JSON: <https://awesomerea.org/resources/opennord-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/opennord-case/index.md)

## Requirements & limits

- **Prerequisites:** Requires compatible Nord Stage files or hardware; USB transfer is available on desktop and supported iPad hardware.
- **Testing evidence:** The author reports Stage 4 decoding and two-way Stage 4 USB transfer validated on hardware; other Nord families remain planned.
- **Limits:** Writing a program overwrites the keyboard slot, so back up the keyboard first.
- **License:** AGPL-3.0-or-later license.

## Primary sources

1. <https://github.com/simonflore/opennord/blob/19b5f59d4511f5a66ebaae86e0c8cfa29f5a68a3/README.md>

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## About this entry

The description was reviewed against primary sources.
Original editorial content: MIT. Linked projects, papers and assets retain their own rights and licenses.