Cable: A USB-A to USB-C or USB-C to USB-C cable with data transfer capability (not charge-only).
Flashing Steps
Connect the Keyboard:
Plug one half of the Corne keyboard into your computer using the USB cable. Start with the left half unless specified otherwise.
Enter Bootloader Mode:
Locate the reset button
Quickly double-click the reset button.
A virtual USB drive named nicenano should appear on your computer.
Troubleshooting:
If nicenano doesn’t appear:
Double-click may be too slow; try again faster.
Check the USB cable and port:
Swap the cable or try a different USB port.
For USB-C to USB-C cables, flip the cable direction.
Ensure the cable supports data transfer, not just charging.
Flash the Settings Reset Firmware:
Copy the reset file to the nicenano drive.
The drive will eject automatically once the copy is complete.
Note: On macOS, an error may appear; ignore it—the copy is still successful.
Repeat this step for the other half (e.g. right side) by connecting it and double-clicking its reset button.
Flash the Firmware:
Re-enter bootloader mode on the left half (double-click reset again; nicenano reappears).
Copy the left-hand firmware file (e.g., containing left) to the nicenano drive. It will eject after flashing.
Connect the right half, enter bootloader mode, and copy the right-hand firmware file (e.g., containing right) to the nicenano drive.
Important:
Flash only one .uf2 file at a time; multiple files will cause errors.
The firmware is converted into executable code during flashing and isn’t stored on the keyboard.
Verify and Troubleshoot:
Left Half Issues:
If the left half won’t connect to the computer:
Remove the keyboard from your computer’s Bluetooth settings.
Type bt-clear-all on the keyboard (if functional) to clear its connection records, then reconnect.
Right Half Issues:
If the right half shows an “X” or Wi-Fi icon but doesn’t input:
Press the reset button once on the right half.
If unresolved, reflash both halves:
Flash reset file to both sides to clear pairing data.
Flash the correct left and right firmware files again.
Pairing Problems:
If the left half shows a gear icon (not a wireless icon) or the PC connection toggles between “Connected” and “Paired”:
Remove the keyboard from your computer’s Bluetooth settings.
Type bt-clear-all on the keyboard to reset connections, then pair again.
Additional Notes
Order Matters: Always flash reset file first for each half before flashing the side-specific firmware.
Bluetooth Channels: The keyboard supports five Bluetooth channels (e.g., bt-sel-0 to bt-sel-4). Ensure you’re on the correct channel for your device. Refer to the keymap or additional documentation for channel-switching keycodes.
Firmware Purpose: Flashing reset file clears pairing and settings, while the left and right files configure the respective halves for operation.
