Flash

This browser can't flash the board. Use Chrome or Edge (desktop, or Chrome on Android) over HTTPS. Firefox, Safari and iOS browsers don't support WebUSB.

Browser report:

Connected to a robot's Systemcore instead? Use the SSH flow in the project's documentation.

This copy of the flasher has no release key configured, so it refuses to flash anything. Set publicKey in release-config.json.

Enter flash mode (the button below stays disabled until the release has downloaded and checked out).
- Board already running firmware: hold your finger on its screen for 5 seconds, then tap Yes, reboot.
- New, blank or unresponsive board: unplug it, hold the BOOTSEL button, plug the USB cable in, then release.
Connect. Press the button and pick the RP2350 boot device in the browser's list.
Wait. The page erases, writes and checks the board by reading it back. Keep the cable plugged in and this page open. When it says done, the board restarts; unplug it only once its screen is back.

Technical log

Troubleshooting

Windows: if the board doesn't appear in the list, the boot-ROM interface may need a WinUSB driver (Zadig, on the interface named RP2 Boot (Interface 1) only, never interface 0).
Linux: install 99-rp2350-bootsel.rules into /etc/udev/rules.d/, run sudo udevadm control --reload-rules, replug. Snap/Flatpak browsers may block USB.
Android: use a USB-C OTG cable; a weakly powered phone can brown the board out.
A failed or interrupted flash is recoverable: the board returns to flash mode on its own, or hold BOOTSEL while plugging in.