ESP8266 Online Flasher
Flash the coin slot in your browser
Put the AJKFi coin slot firmware on an ESP8266 board (NodeMCU) straight from this page. No flashing tool to install and no settings to choose.
Open this page in Google Chrome or Microsoft Edge on a computer (Windows, Mac or Linux). Phones, Firefox and Safari cannot talk to a USB board. Or use the flashing tool in the guide.
Unplug it and put it back in the machine. It joins its Wi-Fi and the router by itself within a minute; Settings → Coinslot Hardware on the router shows the new version. From firmware 2.5 on, the next updates come from the router itself - no USB needed.
Now pair it: tap Pair coin slot on the router (Settings → Coinslot Hardware), then power the board - it joins by itself. See step 3 of the coin slot guide. Replacing a board on a machine: tap Pair new coin slot.
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Before you start
- A computer with Chrome or Edge. Phones cannot do this.
- A USB data cable. A charge-only cable shows no board at all.
- Close NodeMCU PyFlasher, Arduino or any serial monitor - they keep the board's port busy.
- No board in the list? The PC needs the driver for the board's USB chip. Most NodeMCU boards use the CH340: CH340 driver (WCH). Some use the CP2102: CP210x driver (Silicon Labs). Install it, unplug and replug the board.
- Stuck on "Connecting"? Hold the FLASH button on the board, press Connect and flash, and let go when it says Writing.
Prefer a flashing tool? The guide still shows NodeMCU PyFlasher step by step (flash mode DIO). This page uses esptool-js by Espressif (Apache 2.0).