Case study

GameSir Cyclone 2: firmware findings and controller bridge

GameSir Cyclone 2 documents analysis of the controller’s JieLi BR23 firmware, including image layout, instruction encodings, timer behavior and firmware patches. It also describes a Raspberry Pi bridge that maps Bluetooth HID input to an Xbox 360 Wireless Receiver USB interface for Windows XInput.

Targets: Firmware · Protocol
Category: Independent reconstruction cases
Relationship: Independent reconstruction project
Sources reviewed: 2026-11-06
Evidence class: C2 code & docs, no demo or download

Stars: 2
Last commit: 2026-09-10

GitHub data as of 2026-11-10

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Evidence

Observed: Code and documentation observed; no download method or demo found.
Checked: 2026-11-08

How evidence classes are assigned

Requirements & limits

Prerequisites: A GameSir Cyclone 2 and a dump of the user’s own device are needed for firmware patching.
Prerequisites: The bridge needs a separately powered Raspberry Pi; its kernel patch was developed against Linux 6.12.75+rpt-rpi-v8.
Limits: Findings and offsets came from one device and firmware revision.
License: Original code and documentation are MIT licensed; the bridge kernel patch is GPL-2.0-only.

Cite

BibTeX

@misc{gamesir-cyclone2-case,
  title = {{GameSir Cyclone 2: firmware findings and controller bridge}},
  howpublished = {\url{https://github.com/dank0i/cyclone2}},
  url = {https://github.com/dank0i/cyclone2},
  urldate = {2026-11-06},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/gamesir-cyclone2-case/}}
}

Plain text

GameSir Cyclone 2: firmware findings and controller bridge. https://github.com/dank0i/cyclone2 (accessed 2026-11-06). Awesome REA entry: https://awesomerea.org/resources/gamesir-cyclone2-case/

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About this entry

The description was reviewed against primary sources.

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Primary sources

firmware/README.md GitHub · dank0i/cyclone2 · Revision e51ce99
README.md GitHub · dank0i/cyclone2 · Revision e51ce99
bridge/README.md GitHub · dank0i/cyclone2 · Revision e51ce99