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Hacking a WiFi Lamp

Talkat DevConf.CZ 2025 · 2025-06-12..06-14· [security, embedded-and-hardware]
links:none on file
slides:none on file

Device is opened, PCB identifies ESP8285 with 1MB flash and 26 MHz crystal, powered at ~70 mA. Serial pins are wired, boot pins toggled with buttons, oscilloscope reveals nonstandard baud so used setserial at ~76,000 bps and a USB serial adapter to get console output. Firmware is dumped with esptool, analyzed for null-padded SSID (>=5) and password (>=9) patterns, script on GitHub finds the correct Wi‑Fi credentials and a MAC that matches Google location, so the extraction works.

AI-written summary · about

  1. 0:00Introduction
  2. 1:06Wi-Fi lamps overview
  3. 2:13Hardware identification
  4. 3:40Powering and Wi-Fi setup
  5. 5:03Serial communication setup
  6. 7:15Firmware extraction
  7. 8:40Entering programming mode
  8. 10:05Analyzing firmware
  9. 12:51Conclusions
  10. 13:59Q&A
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