If you manage to upload, upload the blink sketch.I would uninstall the drivers for both COM3 and COM4. Only after a reset (double tap or software reset by the IDE), it should change to Arduino NANO 33 IoT bootloader (COM3).Įach of these modes (normal and bootloader) has it's own VID/PID and that is how Windows knows which driver to use.Įither there is a problem on the board that it sends the incorrect VID/PID to your PC or the association on the PC is incorrect. The board should identify itself as Nano33 IoT (COM4 ). But to my knowledge that should not happen. When I connect the USB cable, the device manager displays "Arduino NANO 33 IoT bootloader (COM3)". However, after a while, the problem reoccurs. Resetting the PC temporarily resolves the issue, and a few uploads may work without any problems. This allows the uploading process to complete, but an additional board named "Arduino 33 IoT (COM4)" appears in the device manager.ĭeleting the COM4 entry in the device manager (uninstalling the device) or other unused entries under Universal Serial Bus Controllers (visible when activating the "Show Hidden Devices" option under the View menu) does not help. Sometimes, I am able to resolve this issue by resetting the board with 2 clicks. Failed uploading: uploading error: exit status 1." However, when I try to upload, I receive the following error message: "No device found on COM3. As expected, IDE automatically selects COM3. I have ensured that drivers are up to date. I am using Windows 11 with IDE version 2.1.1, and currently working with the NANO 33 IoT. I recall experiencing similar issues with legacy IDE, but I have not found a solution yet. Behavior is not limited to a particular board or board family, and several USB cables have been tested.
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