# Cindy Band: a client for the Xiaomi Smart Band 8 BLE protocol

> Cindy Band implements PC and Android clients for Xiaomi Smart Band 8 NFC using a documented BLE protocol. The project records FE95 GATT framing, cmd26/27 authentication, HKDF session keys and AES-CCM business frames, alongside a local server and MCP access to band functions.

- Type: Case study
- Targets: Protocol
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-06
- Added to the catalog: 2026-11-08
- Original resource: <https://github.com/Shunamxiao/xiaomi-band8>
- Primary source: <https://github.com/Shunamxiao/xiaomi-band8/blob/e9f84748878d093808281ffc9e407a8c48dbb70e/README.md>
- Catalog page: <https://awesomerea.org/resources/cindy-band-case/>
- Record JSON: <https://awesomerea.org/resources/cindy-band-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/cindy-band-case/index.md)

## Requirements & limits

- **Prerequisites:** A Xiaomi Smart Band 8 NFC and its binding key or an unbound device for experimental local binding.
- **Prerequisites:** Python 3.10 or newer for the PC client, or Android 8.0 or newer for the Android client.
- **Limits:** Local binding field order remains unconfirmed on an unbound device; custom watch faces are still under study.
- **License:** MIT license.

## Primary sources

1. <https://github.com/Shunamxiao/xiaomi-band8/blob/e9f84748878d093808281ffc9e407a8c48dbb70e/README.md>
2. <https://github.com/Shunamxiao/xiaomi-band8/blob/e9f84748878d093808281ffc9e407a8c48dbb70e/docs/auth-protocol-verified.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.