This expansion board only works with Proxmark3X in 2026.
The firmware in ESP32 Expansion Board is open-source on Github.
https://github.com/mtoolstec/esp32-uart-bridge
How to use
- Plugin the ESP32 Extension Board
- Connect to WLAN Adhoc – Proxmark3X, Password – mtoolstec
- Use tcp connection to Proxmark3X: client/proxmark3 tcp:192.168.4.1:18888
- Use it remotely
🔧 Browser-Based Firmware Flasher
Flash firmware to your ESP32 Expansion Board directly in Chrome/Edge — no software install required.
- Supports ESP32 / ESP32-C3 devices
- Works in Chrome / Edge desktop (Web Serial API required)
- One-click flash — no drivers, no CLI tools needed












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