Analysisfirmware reverse engineeringwearablesjieli ac6958embedded security
Researchers Reveal Smartwatch Firmware Produces False Readings
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In December, reverse engineers published a follow-up blog post detailing extraction and analysis of a 2‑MB firmware image from a JieLi AC6958‑based smartwatch, parsing JLFS headers and decrypting a scrambled FATFSI partition using a recovered root key (0x170f). Their analysis recovered app.bin and other files, exposed an LFSR‑based scrambler, and concluded the device's heart‑rate and blood‑pressure measurements are unreliable.
Scoring Rationale
Detailed, reproducible firmware decryption with practical impact; limited scope to a specific JieLi SoC and single device model.
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