Case study

rytm-fw-re: reconstructing Analog Rytm MKII firmware

rytm-fw-re analyses the Elektron Analog Rytm MKII OS 1.74 update and builds a freestanding ColdFire replacement firmware wrapped as a flashable .syx file. Its Ghidra probes and notes cover the ELE3 container, bootstrap entry contract, memory map, display byte protocol and flash path. The author reports that the current replacement boots and displays a test pattern.

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: 8
Last commit: 2026-10-13
Language: Python

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: Reproducing the analysis and hardware checks requires a separately obtained stock OS 1.74 update and an Analog Rytm MKII unit.
Prerequisites: The firmware build uses a nixpkgs m68k cross compiler and invokes ld.bfd directly.
Limits: The replacement OS currently stops after displaying a test pattern; the USB reflash path remains a plan.
License: No licence file in the repository.

Cite

BibTeX

@misc{rytm-fw-re-case,
  title = {{rytm-fw-re: reconstructing Analog Rytm MKII firmware}},
  howpublished = {\url{https://github.com/ethernet8023/rytm-fw-re}},
  url = {https://github.com/ethernet8023/rytm-fw-re},
  urldate = {2026-11-06},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/rytm-fw-re-case/}}
}

Plain text

rytm-fw-re: reconstructing Analog Rytm MKII firmware. https://github.com/ethernet8023/rytm-fw-re (accessed 2026-11-06). Awesome REA entry: https://awesomerea.org/resources/rytm-fw-re-case/

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About this entry

The description was reviewed against primary sources.

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Primary sources

README.md GitHub · ethernet8023/rytm-fw-re · Revision 2f7f0c4
docs/display-protocol.md GitHub · ethernet8023/rytm-fw-re · Revision 2f7f0c4
STATUS.md GitHub · ethernet8023/rytm-fw-re · Revision 2f7f0c4