Power-cycle the device 3 times within 10 seconds to trigger factory reset:
- Clears WiFi credentials (SSID + password) in EEPROM
- Shows "FACTORY RESET / WiFi: TJ56654-Setup / Pass: 12345678" on display
- Reboots into WiFiManager AP mode for reconfiguration
Counter stored at EEPROM offset 480 (well past Config ~260 bytes).
Clears automatically after 10s of stable operation.
Prevents the need for FTDI/USB recovery when credentials are corrupted.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>