The Wifi devboard ships with [Blackmagic firmware](https://github.com/flipperdevices/blackmagic-esp32-s2) installed. The Flipper documentation [is here](https://docs.flipperzero.one/development/hardware/wifi-debugger-module), and Blackmagic is [over here](https://black-magic.org/).
Check out [Frog's write-up](https://github.com/FroggMaster/ESP32-Wi-Fi-Penetration-Tool) and build for quick and easy flashing! Seriously, it's basically just a double-click now thanks to some error checking and automation. ([You're welcome!](https://github.com/FroggMaster/ESP32-Wi-Fi-Penetration-Tool/compare/v1.0...v1.1)).
Another fun project is from [SequoiaSan](https://github.com/SequoiaSan)! Originally designed for an ESP8266, it has been ported to run on the Flipper Wifi Devboard too.<br>
Check out the [Release Info](https://github.com/SequoiaSan/FlipperZero-WiFi-Scanner_Module) and [Install Instructions](https://github.com/SequoiaSan/Guide-How-To-Upload-bin-to-ESP8266-ESP32) direct from the source. (Some pinout info is included there and on my [GPIO page](https://github.com/UberGuidoZ/Flipper/tree/main/GPIO).)
To update the installed FW, you can use the `update -w` option, then follow along from [Step 8 in the install guide](https://github.com/justcallmekoko/ESP32Marauder/wiki/installing-firmware-via-ota).
Also from E_Surge: "Flashed esp32marauder directly to the esp32-s2 using the esptool command -- wasn't working until a PC restart and boom. But it took about three hours of different methods, attempts, and finally restarting of devices etc."
`esptool -p PORT -b 460800 --before default_reset --after hard_reset --chip esp32s2 write_flash --flash_mode dio --flash_freq 80m --flash_size 4MB 0x10000 esp32_marauder_v0_9_9_20220628_flipper.bin`