Biscuit firmware grafts smartphone ambition onto the Xteink X4 e-ink reader, repurposing a $70 device for wireless recon and daily utility. Forked from CrossPoint Reader, it inherits EPUB and OPDS polish while layering an eight-tile dashboard over the 4.26-inch panel. Seven physical buttons navigate WiFi and BLE 5.0 radios, with MicroSD caching apps, books, and captures for days of battery-powered fieldwork.

Passive scanning and active testing suites share the ESP32-C3 RISC-V core, juggling 380KB SRAM and 16MB flash without PSRAM. Deauth detection, probe logging, and wardriving map signal topography, while Ghost Mode rotates MACs and silences radios in one gesture. Offline TOTP, encrypted password storage, mesh chat via ESP-NOW, and DuckyScript HID let the slab act as pen-test lab, communicator, and vault without cloud dependence.

Reading remains a deliberate tile among utilities rather than the device’s sole purpose, with full CrossPoint rendering preserved beneath tactical overlays. Handshakes, probe patterns, and credential captures stay local to SD, while barcode, QR, and steganography tools fuse creative output with disciplined tradecraft. The mod turns a sunlight-readable e-reader into a capable, air-gapped sidekick.