Image: ast0ne1 / project README · CosmoLibre firmware-rendered clock pages
CosmoLibre revives a Cosmo II clock without its cloud
The owner used Claude and Cursor to write local replacement firmware for a Cosmo II e-paper clock after its cloud configuration service stopped working.
Credits
Details reviewed:
The full story
The maker's Cosmo II clock was stuck with the wrong time zone after the manufacturer's cloud service went down. They backed up its flash, inspected the hardware and worked with Claude and Cursor to write replacement ESP8266 firmware.
CosmoLibre keeps configuration on the clock, with NTP time, Open-Meteo weather, display widgets and touch controls. It is tested on the maker's own unit, but battery Wi-Fi behaviour, air-quality sensors and several original features remain unfinished.
Device and compatibility
- Cosmo II e-paper clock; ESP8266EX with 4 MB flashSource ↗
What you need
- Back up the full original flash before installing replacement firmware. Source ↗
Can it be undone?
Reported reversible with backup: The README describes restoring the original full flash dump. Source ↗
What Claude did
- Replacement firmware, documentation and firmware-dump analysis alongside CursorClaude Source ↗
How it was done
Tools
Themes
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Sources
From the maker's own write-up or code. We summarise what they report; we haven't tested it ourselves.
- ast0ne1/cosmolibreRepository account: ast0ne1Repository created
Project repository; source date labels repository creation, not the first completion date of the build.
- Project README and reported test statusSource checked