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Flipper Zero WiFi Multiboard (ESP32-S2) — Complete Guide

One-liner: the WiFi multiboard is an ESP32-S2-powered WiFi tool for the Flipper Zero — typically pre-flashed with the ESP32-S2 Deauther firmware — giving you AP scanning, packet monitoring and (on your own networks) deauth testing, plus a standalone web UI you control from any browser.

Specs at a glance​

ItemSpecification
WiFi chipEspressif ESP32-S2 (2.4 GHz)
Firmware (typical)ESP32-S2 Deauther or Marauder port
Frequency band2.4 GHz only (no 5 GHz)
InterfacePlugs into the Flipper GPIO header
Web UIAP mode at 192.168.4.1 (default SSID pwned, password deauther)

What you can do with it​

The ESP32-S2 Deauther is the classic pocket tool: scan for networks, pick a target, and run attack modes (deauth, beacon spam) — with the Flipper as the control surface. Because the ESP32-S2 also exposes its own access point, you can drive everything from a phone browser at http://192.168.4.1 — the Flipper screen is optional.

Use it on networks you own or have explicit permission to test. Deauth attacks actively disrupt other people's connections; using them on networks you don't control is illegal in most places. The whole point of this tool in a university lab is to learn why unsecured WiFi fails and how to defend it.

Setup​

1. Firmware on the Flipper​

Install a custom firmware (e.g., Momentum) so the WiFi deauther/Marauder apps are available — see the Flipper Zero section.

2. Flash the ESP32-S2 (first time only)​

Most boards ship pre-flashed with Deauther. To (re)flash:

  1. Put the board in flash mode per your vendor's instructions (often a button while powering).
  2. Connect via USB/UART (or use the Flipper's own flasher app).
  3. Flash the ESP32-S2 Deauther binary — sources and pre-built files: SpacehuhnTech/esp32_deauther.

3. Attach to the Flipper​

Plug the board onto the Flipper GPIO header. The vendor does not publish pin or power details for this board, so follow the instructions that came with your unit.

4. First run — scan​

  1. Plug the board in, open Apps → WiFi → WiFi Deauther.
  2. Wait for the startup scan to finish.
  3. A list of nearby APs appears: SSID, channel, RSSI.

Expected app screen:

#  SSID            CH  RSSI
1  yupitek-lab     6   -55
2  Library_Guest   1   -78
...

Using the web UI​

  1. On your phone/PC, join the WiFi network pwned (password deauther).
  2. Browse to http://192.168.4.1.
  3. The full Deauther interface loads: scan, select target, configure attacks, save settings.
  4. Tip: when only using the Flipper for serial control, you can disable the web interface (set webinterface false, save, reboot) to hide the pwned AP.

Troubleshooting​

ProblemCauseFix
Web UI unreachableClient joined another networkDisable auto-join/mobile data; join pwned; browse 192.168.4.1
No networks listedBoard not seated or firmware not runningRe-seat the board on the GPIO header; re-flash the firmware

More help: the SDRLAB troubleshooting hub.