Biscuit: Custom firmware turns Xteink X4 e-paper reader into a multi-purpose smart device
By
unixfg
26d ago· 11 min readenCode
95/100
Golden Brown
Bagelometer↗
Baker's choice. Dense with flavour, light on filler.
Score95TypenewsSentimentpositive
Summary
Biscuit is custom firmware for the Xteink X4 e-paper device (based on ESP32-C3 SoC) that transforms a $70 e-ink reader into a general-purpose smart device. Forked from CrossPoint Reader, it adds wireless tools, security features, communication apps, games, and utilities while preserving full e-reader functionality. The home screen features a tile-based dashboard with live system info, treating reading as one of eight categories rather than the primary focus.
Key quotes
· 5 pulledBiscuit treats the Xteink X4 as a general-purpose smart device, not just an e-reader.
The home screen is a tile-based dashboard with live system info (battery, heap, uptime, WiFi status).
Reading is one of eight categories, not the main focus.
Turns a $70 e-ink reader into a smart device with wireless tools, security features, communication, games, and utilities — while keeping full e-reader functionality.
All core reading functionality comes from CrossPoint. Biscuit builds on top of it.
Firmware for the ESP32-C3 SoC Xteink X4 e-paper display reader - yattsu/biscuit
